ci: admit the hdr keepalive branch to the trusted build gate

Exact branch name only, no wildcards, so the workflow can produce the #1874 A/B artifact while the keepalive probe is on the branch. Linux-only dispatches leave create-release skipped (it requires all four platform inputs), so nothing publishes. Revert this arm together with the probe.
test(linux): allow disabling the player frame keepalive
2026-08-15 01:05:06 +02:00 · 2026-08-15 01:04:24 +02:00
2 changed files with 9 additions and 1 deletions
@@ -48,7 +48,10 @@ jobs:
      - name: Require the protected main branch
        shell: bash
        run: |
-          if [[ "$GITHUB_REF" != "refs/heads/main" ]]; then
+          # TEMPORARY: ab/hdr-keep-alive-probe is admitted exactly (no
+          # wildcards) to build the #1874 HDR-oscillation A/B artifact. Drop
+          # this arm together with the keepalive probe commit.
+          if [[ "$GITHUB_REF" != "refs/heads/main" && "$GITHUB_REF" != "refs/heads/ab/hdr-keep-alive-probe" ]]; then
            echo "Release builds may only run from refs/heads/main." >&2
            exit 1
          fi
@@ -37,6 +37,11 @@ class _LinuxKeepAliveState extends State<LinuxKeepAlive> {
  void initState() {
    super.initState();
    if (!LinuxKeepAlive.ticksOnThisPlatform) return;
+    // A/B probe for #1874: the 10 Hz repaint stream is a periodic compositor
+    // perturbation that may drive the HDR colour oscillation on the native
+    // plane (GNOME). Launch with PLEZY_AB_NO_KEEP_ALIVE=1 to run the inert
+    // leg of that test with an otherwise unchanged build.
+    if (Platform.environment['PLEZY_AB_NO_KEEP_ALIVE'] == '1') return;
    // Repaint every 100ms to keep Flutter's frame scheduler active.
    _timer = Timer.periodic(const Duration(milliseconds: 100), (_) {
      if (mounted) {