misc: fix env and secrets

.gitea/workflows/docker-build.yml

@@ -20,9 +20,9 @@ jobs:
       - name: Log in to GHCR
         uses: docker/login-action@v3
         with:
-          registry: ghcr.io
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
+          registry: ${{ env.GITEA_DOMAIN }}
+          username: ${{ env.GITEA_REGISTRY_USER }}
+          password: ${{ secrets.CONTAINER_REGISTRY_TOKEN }}
 
       - name: Extract metadata for Docker
         id: meta