Configure automatic grpc releases (#303)

* Update README.md

* Create grpc_release.yml

.github/workflows/grpc_release.yml

@@ -0,0 +1,44 @@
+# This worklow will create a new GH release according to the current GRPC_VERSION value in variables.sh
+# It is triggered after a PR from head "renovate/grpc-major-upgrade" is merged to master.
+
+# 'renovate/grpc-major-upgrade' is a branch created by Renovate when it finds a new gRPC version to update in variables.sh
+# Renovate with this worflow allows us to automatically create new releases whenever Google releases a new gRPC version in github.com/grpc/grpc
+
+# All new versions created by this worflow will be suffixed by _0, e.g v1.46_0. At the moment, patches unrelated to the gRPC version (e.g v1.46_1)
+# will still be released manually (for now).
+
+# Note that once a new release is created in GH, a separate workflow will take care of releasing new docker images to dockerhub accordingly.
+
+name: New gPRC Release
+
+on:
+  pull_request:
+    types:
+      - closed
+    branches:    
+      - 'master'
+
+jobs:
+  new_release:
+    if: github.event.pull_request.merged == true && github.head_ref == 'renovate/grpc-major-upgrade'
+    runs-on: ubuntu-latest
+    steps:
+    # checkout the repo
+      - uses: actions/checkout@v2
+        with:
+          submodules: true
+    # install pcregrep to help extrat the version from variables.sh
+      - name: Install pcregrep
+        run: sudo sudo apt-get update -y && sudo apt-get install -y pcregrep
+      - name: Get version name
+        run: |
+          VER=$(pcregrep -o1 "^GRPC_VERSION=\\$\{GRPC_VERSION:-(.*?)\\}$" variables.sh)
+          # This makes the value accessible from env.Version
+          echo "VERSION=v${VER}_0" >> $GITHUB_ENV
+      - name: Create new release
+        if: success()
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run:
+          gh release create ${{ env.VERSION }} --generate-notes --repo $GITHUB_REPOSITORY
+

README.md

@@ -289,7 +289,8 @@ CONTAINER=namely/gen-grpc-gateway:VVV make test-gwy
 
 ### Release
 
-Handled automatically via CI (githubaction).
+Any new gRPC version based release is handled automatically once the relevant [Renovate](https://www.mend.io/free-developer-tools/renovate/) branch is merged to master
+via the CI (Github Action). A patch release should be created manually in Github and the CI workflow will take care of the rest.
 
 #### Contributors