fix: revert to REGISTRY_USER and REGISTRY_PASSWORD secrets

.gitea/workflows/docker.yml

@@ -54,8 +54,8 @@ jobs:
         uses: docker/login-action@v3
         with:
           registry: ${{ env.REGISTRY }}
-          username: lovrog05
-          password: ${{ secrets.PACKAGES_SECRET }}
+          username: ${{ secrets.REGISTRY_USER }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
 
       # Build each platform to a separate Docker-format tar (docker load compatible).
       # We build standard and bundled for each arch in parallel pairs.