Update docker/metadata-action digest to 318604b

Author: renovate[bot]

.github/workflows/docker-publish.yml

@@ -63,7 +63,7 @@ jobs:
       # https://github.com/docker/metadata-action
       - name: Extract Docker metadata
         id: meta
-        uses: docker/metadata-action@032a4b3bda1b716928481836ac5bfe36e1feaad6
+        uses: docker/metadata-action@318604b99e75e41977312d83839a89be02ca4893
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}