Update docker/metadata-action digest to 318604b

Author: renovate[bot]

.github/workflows/docker-publish.yml

@@ -44,7 +44,7 @@ jobs:
       # https://github.com/docker/metadata-action
       - name: Extract Docker metadata
         id: meta
-        uses: docker/metadata-action@60a0d343a0d8a18aedee9d34e62251f752153bdb
+        uses: docker/metadata-action@318604b99e75e41977312d83839a89be02ca4893
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}