chore: basic implementation with healthz

Author: tonitienda

.github/workflows/build-run-test.yaml

@@ -43,7 +43,8 @@ jobs:
           docker push ghcr.io/${{ github.repository_owner }}/kadai/${{ matrix.service }}:${GITHUB_SHA}
       - name: Check Docker image details
         run: |
-          docker manifest inspect ghcr.io/${{ github.repository_owner }}/kadai/${{ matrix.service }}:${GITHUB_SHA}
+          docker images ghcr.io/${{ github.repository_owner }}/kadai/${{ matrix.service }}:${GITHUB_SHA} --format "{{.Size}}"
+
   system:
     runs-on: ubuntu-latest
     needs: build