.github/workflows/nix.yml

@@ -17,7 +17,10 @@ jobs:
   nix:
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest]
+        # Gitea runner fleet currently advertises ubuntu-latest,
+        # ubuntu-22.04, and self-hosted only. Keeping macos-latest here
+        # leaves a permanently queued required context.
+        os: [ubuntu-latest]
     runs-on: ${{ matrix.os }}
     timeout-minutes: 30
     steps:
@@ -69,7 +72,10 @@ jobs:
           exit 1
 
       - name: Post sticky PR comment (stale hashes)
-        if: steps.hash_check.outputs.stale == 'true' && github.event_name == 'pull_request'
+        if: |
+          steps.hash_check.outputs.stale == 'true' &&
+          github.event_name == 'pull_request' &&
+          github.server_url == 'https://github.com'
         uses: marocchino/sticky-pull-request-comment@52423e01640425a022ef5fd42c6fb5f633a02728  # v2.9.1
         with:
           header: nix-lockfile-check
@@ -94,6 +100,7 @@ jobs:
       - name: Clear sticky PR comment (resolved)
         if: |
           github.event_name == 'pull_request' &&
+          github.server_url == 'https://github.com' &&
           runner.os == 'Linux' &&
           (steps.hash_check.outputs.stale == 'false' ||
            (steps.flake.outcome == 'success' && steps.build.outcome == 'success'))