CI: add auth to registry

.forgejo/workflows/build.yaml

@@ -16,7 +16,7 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: 20
-          cache: 'pnpm'
+          cache: "pnpm"
 
       - name: Install dependencies
         run: pnpm install
@@ -32,8 +32,21 @@ jobs:
           containerfiles: |
             ./Containerfile
 
+      - name: Workaround for bug of podman-login
+        run: |
+          mkdir $HOME/.docker
+          echo "{ \"auths\": {} }" > $HOME/.docker/config.json
+
+      - name: Log in to container registry (with another workaround)
+        uses: actions/podman-login@v1
+        with:
+          registry: ${{ vars.REGISTRY }}
+          username: ${{ secrets.REGISTRY_USER }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
+          auth_file_path: /tmp/auth.json
+
       - uses: actions/push-to-registry@v2
         with:
-          registry: "docker://${{ vars.REPOSITORY }}"
+          registry: "docker://${{ vars.REGISTRY }}"
           image: treetrail-frontend
           tags: latest