docker: GitHub actions testing for docker release

- Temporarily adding `rc` tag trigger for testing `Build and push multi-platform docker images` action flow before the final release.

- Added more logs for future debugging.

Changelog-None.

.github/workflows/docker-release.yml

@@ -3,7 +3,7 @@ name: Build and push multi-platform docker images
 on:
   push:
     tags:
-      - '^v[0-9]{2}\.[0-9]{2}(\.[0-9]{1,2})?$'
+      - '^v[0-9]{2}\.[0-9]{2}(\.[0-9]{1,2})?([a-zA-Z0-9]*)?$'
   workflow_dispatch:
     inputs:
       version:
@@ -42,13 +42,20 @@ jobs:
           exit 1
         fi
         echo "VERSION=$VERSION" >> $GITHUB_ENV
-        
+
+    - name: Print GitHub Ref Values
+      run: |
+        echo "GITHUB_REF_TYPE: ${{ github.ref_type }}"
+        echo "GITHUB_REF_NAME: ${{ github.ref_name }}"
+        echo "VERSION ENV: ${{ env.VERSION }}"
+        echo "VERSION: $VERSION"
+
     - name: Build and push Docker image
       uses: docker/build-push-action@v5
       with:
         context: .
         push: true
         platforms: linux/amd64,linux/arm64,linux/arm/v7
         tags: |
-          elementsproject/lightningd:$VERSION
+          elementsproject/lightningd:${{ env.VERSION }}
           elementsproject/lightningd:latest