test(tvos): inspect native reattach renderer output [skip ci]

Author: sachk

.github/workflows/tvos.yml

@@ -2,6 +2,11 @@ name: tvOS source build
 
 on:
   workflow_dispatch:
+    inputs:
+      native-artifact-run:
+        description: Temporary native renderer investigation artifact run
+        required: false
+        default: ''
   push:
     branches: [feature/tvos]
 
@@ -15,6 +20,7 @@ concurrency:
 jobs:
   simulator:
     name: Qt mpv tvOS ${{ matrix.sdk }} build and smoke
+    if: ${{ inputs.native-artifact-run == '' }}
     runs-on: macos-15
     timeout-minutes: 180
     strategy:
@@ -55,3 +61,28 @@ jobs:
             build/tvos/${{ matrix.sdk }}-arm64/install/smoke/spool-tvos-playback-smoke.app
             build/tvos/smoke/*.png
             build/tvos/smoke/result.json
+
+  diagnose:
+    if: ${{ inputs.native-artifact-run != '' }}
+    runs-on: macos-15
+    permissions:
+      contents: read
+      actions: read
+    steps:
+      - uses: actions/checkout@d23441a48e516b6c34aea4fa41551a30e30af803
+        with:
+          persist-credentials: false
+      - name: Download existing native renderer failure
+        env:
+          GH_TOKEN: ${{ github.token }}
+          ARTIFACT_RUN: ${{ inputs.native-artifact-run }}
+        run: gh run download "$ARTIFACT_RUN" --name internal-tvos-appletvsimulator-arm64 --dir build/tvos
+      - name: Launch isolated Apple TV simulator smoke
+        env:
+          SIMCTL_CHILD_SPOOL_TEST_MPV_LOG: '1'
+        run: bash tools/apple/smoke-tvos.sh build/tvos/appletvsimulator-arm64/install/Spool.app
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a
+        if: always()
+        with:
+          name: native-failure-pixels
+          path: build/tvos/smoke