diff --git a/.devcontainer/cuda11.8-conda/devcontainer.json b/.devcontainer/cuda11.8-conda/devcontainer.json
index 39ed2b611..e4c36bcdf 100644
--- a/.devcontainer/cuda11.8-conda/devcontainer.json
+++ b/.devcontainer/cuda11.8-conda/devcontainer.json
@@ -15,7 +15,7 @@
   "overrideFeatureInstallOrder": [
     "./features/rapids-build-utils"
   ],
-  "initializeCommand": ["/bin/bash", "-c", "mkdir -m 0755 -p ${localWorkspaceFolder}/../.{aws,cache,config,conda/pkgs,conda/${localWorkspaceFolderBasename}-cuda11.8-envs} ${localWorkspaceFolder}/../{rmm,kvikio,cudf,raft,cumlprims_mg,cuml,cugraph-ops,cugraph,cuspatial}"],
+  "initializeCommand": ["/bin/bash", "-c", "mkdir -m 0775 -p ${localWorkspaceFolder}/../.{aws,cache,config,conda/pkgs,conda/${localWorkspaceFolderBasename}-cuda11.8-envs} ${localWorkspaceFolder}/../{rmm,kvikio,cudf,raft,cumlprims_mg,cuml,cugraph-ops,cugraph,cuspatial}"],
   "postAttachCommand": ["/bin/bash", "-c", "if [ ${CODESPACES:-false} = 'true' ]; then . devcontainer-utils-post-attach-command; . rapids-post-attach-command; fi"],
   "workspaceFolder": "/home/coder",
   "workspaceMount": "source=${localWorkspaceFolder},target=/home/coder/devcontainers,type=bind,consistency=consistent",
diff --git a/.devcontainer/cuda11.8-pip/devcontainer.json b/.devcontainer/cuda11.8-pip/devcontainer.json
index 14f436964..38a1d3b62 100644
--- a/.devcontainer/cuda11.8-pip/devcontainer.json
+++ b/.devcontainer/cuda11.8-pip/devcontainer.json
@@ -17,7 +17,7 @@
     "./features/cuda",
     "./features/rapids-build-utils"
   ],
-  "initializeCommand": ["/bin/bash", "-c", "mkdir -m 0755 -p ${localWorkspaceFolder}/../.{aws,cache,config/pip,local/share/${localWorkspaceFolderBasename}-cuda11.8-venvs} ${localWorkspaceFolder}/../{rmm,kvikio,cudf,raft,cumlprims_mg,cuml,cugraph-ops,cugraph,cuspatial}"],
+  "initializeCommand": ["/bin/bash", "-c", "mkdir -m 0775 -p ${localWorkspaceFolder}/../.{aws,cache,config/pip,local/share/${localWorkspaceFolderBasename}-cuda11.8-venvs} ${localWorkspaceFolder}/../{rmm,kvikio,cudf,raft,cumlprims_mg,cuml,cugraph-ops,cugraph,cuspatial}"],
   "postAttachCommand": ["/bin/bash", "-c", "if [ ${CODESPACES:-false} = 'true' ]; then . devcontainer-utils-post-attach-command; . rapids-post-attach-command; fi"],
   "workspaceFolder": "/home/coder",
   "workspaceMount": "source=${localWorkspaceFolder},target=/home/coder/devcontainers,type=bind,consistency=consistent",
diff --git a/.devcontainer/cuda12.0-conda/devcontainer.json b/.devcontainer/cuda12.0-conda/devcontainer.json
index 1756a1b99..0efb36084 100644
--- a/.devcontainer/cuda12.0-conda/devcontainer.json
+++ b/.devcontainer/cuda12.0-conda/devcontainer.json
@@ -15,7 +15,7 @@
   "overrideFeatureInstallOrder": [
     "./features/rapids-build-utils"
   ],
-  "initializeCommand": ["/bin/bash", "-c", "mkdir -m 0755 -p ${localWorkspaceFolder}/../.{aws,cache,config,conda/pkgs,conda/${localWorkspaceFolderBasename}-cuda12.0-envs} ${localWorkspaceFolder}/../{rmm,kvikio,cudf,raft,cumlprims_mg,cuml,cugraph-ops,cugraph,cuspatial}"],
+  "initializeCommand": ["/bin/bash", "-c", "mkdir -m 0775 -p ${localWorkspaceFolder}/../.{aws,cache,config,conda/pkgs,conda/${localWorkspaceFolderBasename}-cuda12.0-envs} ${localWorkspaceFolder}/../{rmm,kvikio,cudf,raft,cumlprims_mg,cuml,cugraph-ops,cugraph,cuspatial}"],
   "postAttachCommand": ["/bin/bash", "-c", "if [ ${CODESPACES:-false} = 'true' ]; then . devcontainer-utils-post-attach-command; . rapids-post-attach-command; fi"],
   "workspaceFolder": "/home/coder",
   "workspaceMount": "source=${localWorkspaceFolder},target=/home/coder/devcontainers,type=bind,consistency=consistent",
diff --git a/.devcontainer/cuda12.0-pip/devcontainer.json b/.devcontainer/cuda12.0-pip/devcontainer.json
index 3ed7f2791..1cf6e2bb5 100644
--- a/.devcontainer/cuda12.0-pip/devcontainer.json
+++ b/.devcontainer/cuda12.0-pip/devcontainer.json
@@ -17,7 +17,7 @@
     "./features/cuda",
     "./features/rapids-build-utils"
   ],
-  "initializeCommand": ["/bin/bash", "-c", "mkdir -m 0755 -p ${localWorkspaceFolder}/../.{aws,cache,config/pip,local/share/${localWorkspaceFolderBasename}-cuda12.0-venvs} ${localWorkspaceFolder}/../{rmm,kvikio,cudf,raft,cumlprims_mg,cuml,cugraph-ops,cugraph,cuspatial}"],
+  "initializeCommand": ["/bin/bash", "-c", "mkdir -m 0775 -p ${localWorkspaceFolder}/../.{aws,cache,config/pip,local/share/${localWorkspaceFolderBasename}-cuda12.0-venvs} ${localWorkspaceFolder}/../{rmm,kvikio,cudf,raft,cumlprims_mg,cuml,cugraph-ops,cugraph,cuspatial}"],
   "postAttachCommand": ["/bin/bash", "-c", "if [ ${CODESPACES:-false} = 'true' ]; then . devcontainer-utils-post-attach-command; . rapids-post-attach-command; fi"],
   "workspaceFolder": "/home/coder",
   "workspaceMount": "source=${localWorkspaceFolder},target=/home/coder/devcontainers,type=bind,consistency=consistent",
diff --git a/.github/actions/devcontainer-json/action.yml b/.github/actions/devcontainer-json/action.yml
index c6a5596ef..7167635a7 100644
--- a/.github/actions/devcontainer-json/action.yml
+++ b/.github/actions/devcontainer-json/action.yml
@@ -22,7 +22,7 @@ runs:
   steps:
 
     - name: Setup Node.js
-      if: contains(runner.name, 'rapidsai') == true
+      if: contains(runner.name, 'testing') == true
       uses: actions/setup-node@v3
       with:
         node-version: '16'
diff --git a/.github/actions/setup-runner-env/action.yml b/.github/actions/setup-runner-env/action.yml
index 10f1061ac..5ad7dff94 100644
--- a/.github/actions/setup-runner-env/action.yml
+++ b/.github/actions/setup-runner-env/action.yml
@@ -6,29 +6,25 @@ runs:
   using: composite
   steps:
 
-    - if: contains(runner.name, 'rapidsai') != true
+    - if: contains(runner.name, 'testing') != true
       name: Free up disk space
       uses: ./.github/actions/free-disk-space
       with:
         tool_cache: "${{ runner.tool_cache }}"
 
-    - if: contains(runner.name, 'rapidsai') == true
+    - if: contains(runner.name, 'testing') == true
       name: Setup self-hosted runner environment
       shell: bash -eo pipefail {0}
       run: |
         echo "HOME=${{ runner.workspace }}" >> $GITHUB_ENV;
         echo "TMPDIR=${{ runner.temp }}" >> $GITHUB_ENV;
 
-    - if: contains(runner.name, 'rapidsai') == true
+    - if: contains(runner.name, 'testing') == true
       name: Setup Node.js
       uses: actions/setup-node@v3
       with:
         node-version: '16'
 
-    - if: contains(runner.name, 'rapidsai') != true
-      name: Set up QEMU
-      uses: docker/setup-qemu-action@v2
-
     - name: Create docker context
       shell: bash
       run: docker context create builder
@@ -38,3 +34,19 @@ runs:
       with:
         buildkitd-flags: --debug
         endpoint: builder
+        config-inline: |
+          debug = true
+          [registry."docker.io"]
+            mirrors = ["https://dc.arc-eks.gha-runners.nvidia.com"]
+
+    - name: Create Dockerfile
+      shell: bash
+      run: |
+        cat > ./Dockerfile <<EOF
+        FROM ubuntu:22.04
+        EOF
+
+    - name: Build
+      uses: docker/build-push-action@v4
+      with:
+        context: .
diff --git a/.github/workflows/build-and-test-feature.yml b/.github/workflows/build-and-test-feature.yml
index fcca147d8..69ea8b408 100644
--- a/.github/workflows/build-and-test-feature.yml
+++ b/.github/workflows/build-and-test-feature.yml
@@ -14,7 +14,7 @@ jobs:
 
   test:
     name: ${{ inputs.name }} (${{ matrix.arch }})
-    runs-on: ${{ fromJSON(github.repository != 'rapidsai/devcontainers' && '"ubuntu-latest"' || format('"linux-{0}-cpu4"', matrix.arch)) }}
+    runs-on: ${{ fromJSON(github.repository != 'rapidsai/devcontainers' && '"ubuntu-latest"' || format('"linux-{0}-cpu4-testing"', matrix.arch)) }}
     strategy:
       fail-fast: false
       matrix:
diff --git a/.github/workflows/build-test-and-push-linux-image.yml b/.github/workflows/build-test-and-push-linux-image.yml
index ad4ae47d9..360ef6979 100644
--- a/.github/workflows/build-test-and-push-linux-image.yml
+++ b/.github/workflows/build-test-and-push-linux-image.yml
@@ -29,7 +29,7 @@ jobs:
 
   build-test-and-upload:
     name: Build (${{ matrix.arch }})
-    runs-on: ${{ fromJSON(github.repository != 'rapidsai/devcontainers' && '"ubuntu-latest"' || format('"linux-{0}-cpu4"', matrix.arch)) }}
+    runs-on: ${{ fromJSON(github.repository != 'rapidsai/devcontainers' && '"ubuntu-latest"' || format('"linux-{0}-cpu4-testing"', matrix.arch)) }}
     strategy:
       fail-fast: false
       matrix:
diff --git a/features/src/llvm/devcontainer-feature.json b/features/src/llvm/devcontainer-feature.json
index 9d7289fbe..114a4a498 100644
--- a/features/src/llvm/devcontainer-feature.json
+++ b/features/src/llvm/devcontainer-feature.json
@@ -39,7 +39,7 @@
   "updateContentCommand": [
     "/bin/bash",
     "-c",
-    "mkdir -m 0755 -p ~/.config/clangd && cp -n /etc/skel/.config/clangd/config.yaml ~/.config/clangd/config.yaml"
+    "mkdir -m 0775 -p ~/.config/clangd && cp -n /etc/skel/.config/clangd/config.yaml ~/.config/clangd/config.yaml"
   ],
   "customizations": {
     "vscode": {
diff --git a/features/src/utils/install.sh b/features/src/utils/install.sh
index 2925ef5fb..6d06ad792 100644
--- a/features/src/utils/install.sh
+++ b/features/src/utils/install.sh
@@ -110,11 +110,11 @@ for dir in $(for_each_user_bashrc 'echo "$(dirname "$(realpath -m "$0")")"'); do
     rm -f "${dir}"/.gitconfig;
     cp .gitconfig "${dir}"/.gitconfig.default;
     # Create ~/.cache, i.e. $XDG_CACHE_HOME
-    mkdir -p -m 0755 "${dir}"/.cache;
+    mkdir -p -m 0775 "${dir}"/.cache;
     # Create ~/.cache, i.e. $XDG_CONFIG_HOME
-    mkdir -p -m 0755 "${dir}"/.config/{clangd,pip};
+    mkdir -p -m 0775 "${dir}"/.config/{clangd,pip};
     # Create ~/.local/state, i.e. $XDG_STATE_HOME
-    mkdir -p -m 0755 "${dir}"/.local/state;
+    mkdir -p -m 0775 "${dir}"/.local/state;
     # Create or update ~/.ssh/known_hosts
     mkdir -p -m 0700 "${dir}"/.ssh;
     touch "${dir}"/.ssh/known_hosts;
@@ -140,7 +140,7 @@ usermod -aG crontab "${USERNAME}";
 echo "${USERNAME}" >> /etc/cron.allow;
 
 # Create ~/.cache, i.e. $XDG_CONFIG_HOME
-mkdir -p -m 0755 "${USERHOME}"/.local/bin;
+mkdir -p -m 0775 "${USERHOME}"/.local/bin;
 
 # Ensure the user owns their homedir
 chown -R "${USERNAME}:${USERNAME}" "${USERHOME}";
diff --git a/image/.devcontainer/devcontainer.json b/image/.devcontainer/devcontainer.json
index 285bf580e..15290061f 100644
--- a/image/.devcontainer/devcontainer.json
+++ b/image/.devcontainer/devcontainer.json
@@ -45,7 +45,7 @@
   "updateContentCommand": [
     "/bin/bash",
     "-c",
-    "mkdir -m 0755 -p ~/.config/clangd && cp -n /etc/skel/.config/clangd/config.yaml ~/.config/clangd/config.yaml"
+    "mkdir -m 0775 -p ~/.config/clangd && cp -n /etc/skel/.config/clangd/config.yaml ~/.config/clangd/config.yaml"
   ],
   "customizations": {
     "vscode": {
diff --git a/scripts/run.sh b/scripts/run.sh
index a959cd136..d1e09dbed 100755
--- a/scripts/run.sh
+++ b/scripts/run.sh
@@ -19,7 +19,7 @@ run_devcontainer() {
         --image-name "docker.io/rapidsai/devcontainers:${tag}" \
         ;
 
-    mkdir -p -m 0755 .scratch/.{aws,cache,config};
+    mkdir -p -m 0775 .scratch/.{aws,cache,config};
 
     local term="${TERM:-}";
     local lines="$(tput lines)";