feat: add auto-update versions workflow

The new workflow added in `.github/workflows/auto-update-versions.yml` takes care of automatically updating the Vespa version in the project's documentation. The workflow is triggered either manually or on a daily schedule, and it fetches the latest Vespa version from the Maven repository and updates the relevant files in the repository.

.github/workflows/auto-update-versions.yml

@@ -0,0 +1,52 @@
+name: Auto-update versions
+#
+#  Takes care of updating the Vespa version in the documentation.
+#
+
+on:
+  workflow_dispatch: # Allow manual triggering of the workflow
+
+  schedule:
+    - cron: "0 0 * * *"
+
+  repository_dispatch:
+    types: [update-vespa-version]
+
+  # For testing purposes
+  push:
+    branches: [auto-update-versions]
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  update-vespa-version:
+    runs-on: ubuntu-24.04
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y xq
+
+      - name: Get Latest Vespa version
+        run: |
+          VESPA_VERSION=$(curl -sSL https://repo1.maven.org/maven2/com/yahoo/vespa/parent/maven-metadata.xml | \
+           xq -x '/metadata/versioning/latest')
+
+          echo "Vespa version: $VESPA_VERSION"
+
+          sed -i'' "s/vespa_version: \"[0-9\.]*\"/vespa_version: \"\${VESPA_VERSION}\"/" _config.yml
+          git diff
+
+          changes=\$(git status --porcelain | wc -l)
+          if (( changes > 0 )); then
+            echo "Updating Vespa version in documentation to \${VESPA_VERSION}"
+            git commit -m "Update Vespa-version to \${VESPA_VERSION} MERGEOK" _config.yml
+            git pull --rebase
+            # Temp disabled while testing
+            # git push
+          fi

_config.yml

@@ -55,7 +55,7 @@ exclude:
 search:
   namespace: "open"
   doc_type: "doc"
-  do_feed  : true
+  do_feed: true
   do_index_removal_before_feed: false
   feed_endpoints:
     - url: https://vespacloud-docsearch.vespa-team.aws-us-east-1c.z.vespa-app.cloud/
@@ -75,12 +75,11 @@ search:
         - open_index.json
 
 defaults:
-  -
-    scope:
-      path  : ""
+  - scope:
+      path: ""
     values:
       layout: "default"
-      index : true
+      index: true
 
 variables:
-  vespa_version: "8.388.11"
+  vespa_version: "CHANGED FOR TESTING PURPOSES"