Update gradle.yml

Append date to the uploaded artifact

.github/workflows/gradle.yml

@@ -21,6 +21,8 @@ jobs:
         uses: actions/checkout@v2
         with:
           token: ${{ secrets.GH_TOKEN }}
+      - name: Set current date as env variable
+        run: echo "NOW=$(date +'%Y-%m-%dT%H%M%S')" >> $GITHUB_ENV
       - uses: gradle/wrapper-validation-action@v1
       - name: Set up JDK
         uses: actions/setup-java@v3
@@ -30,7 +32,7 @@ jobs:
       - name: Extract branch name
         if: success()
         id: extract_branch
-        run: echo "value=${GITHUB_REF:11}" >> $GITHUB_OUTPUT
+        run: echo "value=${GITHUB_BASE_REF:-${GITHUB_REF#refs/heads/}}" >> $GITHUB_OUTPUT
       - name: Build Documentation
         uses: gradle/gradle-build-action@v2
         with:
@@ -45,8 +47,8 @@ jobs:
         if: success()
         uses: actions/upload-artifact@v3
         with:
-          name: grails-docs.zip
-          path: ./build/distributions/grails-docs-*.zip
+          name: grails-docs-${{ env.NOW }}.zip
+          path: ./build/distributions/grails-docs-*.*.zip
       - name: Determine docs target repository
         if: success()
         uses: haya14busa/action-cond@v1