Update docker/metadata-action digest to b798ed8

Author: renovate[bot]

.github/workflows/docker-image.yml

@@ -32,7 +32,7 @@ jobs:
 
       - name: Extract metadata (tags, labels) for Docker
         id: meta
-        uses: docker/metadata-action@9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7
+        uses: docker/metadata-action@b798ed8388581f6f002541048b6458ca2c4ba442
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}