Merge bitcoin/bitcoin#34080: ci: Pin native tests on cross-builds to same commit

faa8ee62f5 ci: Pin native tests on cross-builds to same commit (MarcoFalke)

Pull request description:

  After commit 13809b867a, the native tests may check out a different commit than the cross-build task that produced the artefacts they run on.

  Obviously, this may lead to test failures.

  Fix it, by first determining a fixed commit, to be used for both the build and the native tests.

  An alternative could be to fully or partially revert 13809b867a, but that comes again with the downsides making it harder to detect silent merge conflicts by re-running CI, or clearing unrelated and fixed intermittent test issues by re-running CI. Then, the only alternative would be to close and re-open the pull request.

ACKs for top commit:
  janb84:
    ACK faa8ee62f5
  ryanofsky:
    Code review ACK faa8ee62f5. Thanks for the naming & display updates since last review!
  hodlinator:
    crACK faa8ee62f5

Tree-SHA512: 01391cdfad34e3f2f5b3a6247b1aeb412d023e368bc17572aa66324688439786e79e263288276053ffcfa8521635b07339dbf087b8a30d6670373556a77c22ee

.github/workflows/ci.yml

@@ -30,7 +30,7 @@ defaults:
 
 jobs:
   runners:
-    name: 'determine runners'
+    name: '[meta] determine runners'
     runs-on: ubuntu-latest
     outputs:
       provider: ${{ steps.runners.outputs.provider }}
@@ -343,9 +343,23 @@ jobs:
         run: |
           py -3 test/fuzz/test_runner.py --par $NUMBER_OF_PROCESSORS --loglevel DEBUG "${RUNNER_TEMP}/qa-assets/fuzz_corpora"
 
+  record-frozen-commit:
+    # Record frozen commit, so that the native tests on cross-builds can run on
+    # the exact same commit id of the build.
+    name: '[meta] record frozen commit'
+    runs-on: ubuntu-latest
+    outputs:
+      commit: ${{ steps.record-commit.outputs.commit }}
+    steps:
+      - *ANNOTATION_PR_NUMBER
+      - *CHECKOUT
+      - name: Record commit
+        id: record-commit
+        run: echo "commit=$(git rev-parse HEAD)" >> "$GITHUB_OUTPUT"
+
   windows-cross:
     name: 'Windows-cross to x86_64, ${{ matrix.crt }}'
-    needs: runners
+    needs: [runners, record-frozen-commit]
     runs-on: ${{ needs.runners.outputs.provider == 'cirrus' && 'ghcr.io/cirruslabs/ubuntu-runner-amd64:24.04-sm' || 'ubuntu-24.04' }}
     if: ${{ vars.SKIP_BRANCH_PUSH != 'true' || github.event_name == 'pull_request' }}
 
@@ -368,7 +382,10 @@ jobs:
     steps:
       - *ANNOTATION_PR_NUMBER
 
-      - *CHECKOUT
+      - name: Checkout
+        uses: actions/checkout@v5
+        with:
+          ref: ${{ needs.record-frozen-commit.outputs.commit }}
 
       - name: Configure environment
         uses: ./.github/actions/configure-environment
@@ -402,7 +419,7 @@ jobs:
   windows-native-test:
     name: 'Windows, ${{ matrix.crt }}, test cross-built'
     runs-on: windows-2022
-    needs: windows-cross
+    needs: [windows-cross, record-frozen-commit]
 
     strategy:
       fail-fast: false
@@ -421,7 +438,10 @@ jobs:
     steps:
       - *ANNOTATION_PR_NUMBER
 
-      - *CHECKOUT
+      - name: Checkout
+        uses: actions/checkout@v5
+        with:
+          ref: ${{ needs.record-frozen-commit.outputs.commit }}
 
       - name: Download built executables
         uses: actions/download-artifact@v5