don't use rhel image

.gitea/workflows/check_releases.yaml

@@ -8,15 +8,7 @@ jobs:
     env:
       TARGET_REPO_OWNER: "prefix-dev"
       TARGET_REPO_NAME: "pixi"
-    container:
-      image: gitea.psi.ch/images/rhel9-developer-gitea-actions
     steps:
-      - name: Setup Node.js
-        uses: actions/setup-node@v4
-        with:
-          node-version: "20" # Specify your target version (e.g., 18, 20, 22, or 'lts/*')
-          # cache: "npm" # Optional: Cache dependencies for faster builds
-
       - name: Check
         run: |
           echo "Checking for new releases ..."