[CI] Add rich build information for github workflows

This patch adds rich test failure information to the Github output,
using the same library that is used for the buildkite pipeline.
Eventually I think we want to add more information like reproduction
information using the containers, but that is very divergent between
Github and Buildkite, so we probably want to wait until we've switched
over before doing that.

Reviewers: Keenuts, tstellar, lnihlen, DavidSpickett

Reviewed By: DavidSpickett, Keenuts

Pull Request: #133197

Author: boomanaiden154

.ci/generate_test_report_github.py

@@ -0,0 +1,23 @@
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+"""Script to generate a build report for Github."""
+
+import argparse
+
+import generate_test_report_lib
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        "title", help="Title of the test report, without Markdown formatting."
+    )
+    parser.add_argument("return_code", help="The build's return code.", type=int)
+    parser.add_argument("junit_files", help="Paths to JUnit report files.", nargs="*")
+    args = parser.parse_args()
+
+    report, _ = generate_test_report_lib.generate_report_from_files(
+        args.title, args.return_code, args.junit_files, None
+    )
+
+    print(report)

.ci/monolithic-linux.sh

@@ -40,6 +40,9 @@ function at-exit {
   then
     python3 "${MONOREPO_ROOT}"/.ci/generate_test_report_buildkite.py ":linux: Linux x64 Test Results" \
       "linux-x64-test-results" $retcode "${BUILD_DIR}"/test-results.*.xml
+  else
+    python3 "${MONOREPO_ROOT}"/.ci/generate_test_report_github.py ":linux: Linux x64 Test Results" \
+      $retcode "${BUILD_DIR}"/test-results.*.xml >> $GITHUB_STEP_SUMMARY
   fi
 }
 trap at-exit EXIT

.ci/monolithic-windows.sh

@@ -39,6 +39,9 @@ function at-exit {
   then
     python "${MONOREPO_ROOT}"/.ci/generate_test_report_buildkite.py ":windows: Windows x64 Test Results" \
       "windows-x64-test-results" $retcode "${BUILD_DIR}"/test-results.*.xml
+  else
+    python "${MONOREPO_ROOT}"/.ci/generate_test_report_github.py ":windows: Windows x64 Test Results" \
+      $retcode "${BUILD_DIR}"/test-results.*.xml >> $GITHUB_STEP_SUMMARY
   fi
 }
 trap at-exit EXIT