Add image-tag to concurrency group of build-push-docker.yml

Author: puehringer

.github/workflows/build-push-docker.yml

@@ -34,7 +34,7 @@ permissions:
   contents: read
 
 concurrency:
-  group: '${{ github.workflow }}-${{ github.ref || github.head_ref }}'
+  group: '${{ github.workflow }}-${{ github.ref || github.head_ref }}-${{ github.event.inputs.image_tag }}'
   cancel-in-progress: true
 
 env: