fix: write registry auth directly to docker config.json instead of login

.forgejo/workflows/test.yml

@@ -34,8 +34,11 @@ jobs:
       - name: Stop container
         run: docker compose down
 
-      - name: Login to Gitea Container Registry
-        run: echo "${{ secrets.REGISTRY_TOKEN }}" | docker login http://192.168.8.174:3000 -u "${{ secrets.REGISTRY_USER }}" --password-stdin
+      - name: Setup registry auth
+        run: |
+          mkdir -p ~/.docker
+          AUTH=$(echo -n "${{ secrets.REGISTRY_USER }}:${{ secrets.REGISTRY_TOKEN }}" | base64 -w0)
+          echo "{\"auths\":{\"http://192.168.8.174:3000\":{\"auth\":\"$AUTH\"}}}" > ~/.docker/config.json
 
       - name: Push image to registry
         run: docker push 192.168.8.174:3000/vrubel/t2s-telegram-bot:latest