Update docker/metadata-action digest to 906ecf0

Author: renovate[bot]

.github/workflows/docker-image.yml

@@ -28,7 +28,7 @@ jobs:
 
       - name: Extract metadata (tags, labels) for Docker
         id: meta
-        uses: docker/metadata-action@6d6eaf34518db036006be0b031c21fd4eb72ef69
+        uses: docker/metadata-action@906ecf0fc0a80f9110f79d9e6c04b1080f4a2621
         with:
           images: |
             ghcr.io/${{ github.repository }}