Automatically release when a version bump is merged

We set the version in client-library-templates

Author: jamiecobbett

.github/workflows/auto-release.yml

@@ -0,0 +1,47 @@
+name: Create Release
+
+on:
+  push:
+    branches: [master]
+    paths:
+      - 'build.gradle'
+
+permissions:
+  contents: write
+
+jobs:
+  create_release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+
+      - name: Get version from build.gradle
+        id: version
+        run: |
+          VERSION=$(grep "^version = " build.gradle | sed "s/version = '\(.*\)'/\1/")
+          echo "version=$VERSION" >> $GITHUB_OUTPUT
+
+      - name: Check if tag exists
+        id: check
+        run: |
+          VERSION="${{ steps.version.outputs.version }}"
+          if git rev-parse "v${VERSION}" >/dev/null 2>&1; then
+            echo "Tag v${VERSION} already exists, skipping release"
+            echo "should_release=false" >> $GITHUB_OUTPUT
+          else
+            echo "Tag v${VERSION} does not exist, will create release"
+            echo "should_release=true" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Create tag and release
+        if: steps.check.outputs.should_release == 'true'
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git tag v${{ steps.version.outputs.version }}
+          git push origin v${{ steps.version.outputs.version }}
+          gh release create v${{ steps.version.outputs.version }} --generate-notes
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}