Reworked the maintenance action to use an ssh key.

.gitea/workflows/maintenance.yaml

@@ -22,13 +22,7 @@ jobs:
     - uses: actions/checkout@v4
       with:
         ref: main
-        token: ${{ secrets.REPO_TOKEN }}
-    - name: Attempt to checkout specific branch
-      uses: actions/checkout@v4
-      with:
-        ref: ${{ env.SPECIFIC_BRANCH }}
-        token: ${{ secrets.REPO_TOKEN }}
-      continue-on-error: true
+        ssh-key: ${{ secrets.SSH_RUNNER }}
     - uses: actions/setup-python@v4
     - run: pip install pre-commit
       shell: bash