ci: restore publishing Docker images

.gitea/workflows/publish.yaml

@@ -21,16 +21,22 @@ jobs:
         with:
           username: ${{ secrets.DOCKER_REGISTRY_USERNAME }}
           password: ${{ secrets.DOCKER_REGISTRY_PASSWORD }}
-          registry: ${{ var.REGISTRY }}
-      - uses: cachix/install-nix-action@v27
+          registry: ${{ vars.REGISTRY }}
+      - uses: cachix/install-nix-action@v30
         with:
           nix_path: nixpkgs=channel:nixos-unstable
+          extra_nix_config: |
+            sandbox = true
       - name: Build Docker image
+        env:
+          HOME: ${{ gitea.workspace }}
         run: nix develop --command -- just backend build-docker
-      - name: Load Docker image
-        run: docker load < result
+      - name: Load Docker Image
+        run: |
+          docker load < ./gejdr-backend/result
       - name: Docker Metadata action
         uses: docker/metadata-action@v5.6.1
+        id: meta
         with:
           image: gejdr-backend:latest
           tags:
@@ -44,3 +50,13 @@ jobs:
             org.opencontainers.image.title=Backend GéJDR
             org.opencontainers.image.description=Backend for GéJDR
             org.opencontainers.image.vendor=Lucien Cartier-Tilet <lucien@phundrak.com>
+      - name: Retag and publish Docker image for backend
+        env:
+          TAGS: ${{ steps.meta.outputs.tags }}
+        run: |
+          for tag in ${{ steps.meta.outputs.tags }}; do
+            newtag=${{ vars.REGISTRY }}/$tag
+            echo $newtag
+            # docker tag gejdr-backend:latest $newtag
+            # docker push $newtag
+          done