feat: generate a ClusterImageCatalog on image update

Signed-off-by: Niccolò Fei <niccolo.fei@enterprisedb.com>

.github/workflows/build.yml

@@ -103,10 +103,35 @@ jobs:
         sarif_file: snyk.sarif
 
     - name: Build and push
+      id: build
       uses: docker/build-push-action@v5
       with:
         context: ${{ matrix.dir }}
         file: ${{ matrix.file }}
         platforms: ${{ matrix.platforms }}
         push: true
         tags: ${{ env.TAGS }}
+
+    - name: Write matrix outputs
+      uses: cloudposse/github-action-matrix-outputs-write@v1
+      with:
+        matrix-step-name: ${{ github.job }}
+        matrix-key: ${{ matrix.version }}
+        outputs: |-
+          digest: ghcr.io/${{ env.IMAGE_RELEASE }}:${{ steps.build.outputs.digest }}
+          major: ${{ matrix.version }}
+
+  read:
+    name: Read build matrix outputs
+    runs-on: ubuntu-22.04
+    needs: build
+    steps:
+      - name: Read matrix outputs
+        uses: cloudposse/github-action-matrix-outputs-read@v1
+        id: read
+        with:
+          matrix-step-name: build
+
+      - name: Test output
+        run: |
+          echo "${{ fromJson(steps.read.outputs.result) }}"