chore: add action to update base image (#33)

* chore: add action to update base image

* rename action

* update action

Author: ravisingal

.github/workflows/update-docker-args.yml

@@ -0,0 +1,58 @@
+name: Update Docker Args
+on:
+  schedule:
+    - cron: 0 1 * * 1
+  workflow_dispatch:
+jobs:
+  update-docker-args:
+    runs-on: ubuntu-22.04
+    permissions:
+      contents: write
+      pull-requests: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Update Docker Args
+        shell: bash
+        id: args
+        run: |
+          BASE_IMAGE="gcr.io/distroless/cc-debian12"
+          BASE_IMAGE_TAG="debug"
+          BASE_IMAGE_DIGEST=$(gcloud container images list-tags $BASE_IMAGE --format json | jq --arg tag "$BASE_IMAGE_TAG" -r '.[] | {digest: .digest, tag: .tags[]} | select(.tag == $tag) | .digest')
+          if [ -n "$BASE_IMAGE_DIGEST" ]; then
+            echo -n "${BASE_IMAGE}:${BASE_IMAGE_TAG}@${BASE_IMAGE_DIGEST}" > java-11/base.image
+            echo -n "${BASE_IMAGE}:${BASE_IMAGE_TAG}@${BASE_IMAGE_DIGEST}" > java-21/base.image
+            echo "digest=${BASE_IMAGE_DIGEST}" >> $GITHUB_OUTPUT
+          else
+            echo "digest=null" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Create Pull Request
+        if: steps.args.outputs.digest != 'null'
+        uses: peter-evans/create-pull-request@v6
+        id: create-pull-request
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          title: Update docker args (Automated)
+          body: |
+            # Autogenerated docker args update:
+            digest: ${{ steps.args.outputs.digest }}
+          commit-message: Update docker args
+          delete-branch: true
+          branch-suffix: timestamp
+
+      - name: Enable Pull Request Automerge
+        if: steps.args.outputs.digest != 'null'
+        uses: peter-evans/enable-pull-request-automerge@v3
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          pull-request-number: ${{ steps.create-pull-request.outputs.pull-request-number }}
+          merge-method: squash
+
+    #   - name: Approve Pull Request
+    #     if: steps.args.outputs.digest != 'null'
+    #     uses: juliangruber/approve-pull-request-action@v2
+    #     with:
+    #       github-token: ${{ secrets.GITHUB_TOKEN }}
+    #       number: ${{ steps.create-pull-request.outputs.pull-request-number }}