fix: add environment variable for Docker metadata annotations levels (#68)

Author: jonigl

.github/workflows/build_and_push_docker_image.yml

@@ -63,6 +63,8 @@ jobs:
       - name: 'Docker metadata'
         id: meta
         uses: docker/metadata-action@v5
+        env:
+          DOCKER_METADATA_ANNOTATIONS_LEVELS: manifest,index
         with:
           images: ghcr.io/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}
           tags: |