Include failure messages in release diagnostics annotations

Author: O2eg

.github/workflows/release-diagnostics.yml

@@ -22,7 +22,7 @@ jobs:
           PG_DIAG_DOCKER_INTEGRATION: "1"
           PYTHONDONTWRITEBYTECODE: "1"
         run: python -m pytest -q -p no:cacheprovider --junitxml=release-tests.xml
-      - name: Report failed test names
+      - name: Report failed tests
         if: always()
         run: |
           python - <<'PY'
@@ -33,8 +33,13 @@ jobs:
               print("::error::pytest did not produce its result document")
           else:
               for case in ET.parse(path).iter("testcase"):
-                  if case.find("failure") is not None or case.find("error") is not None:
+                  failure = case.find("failure")
+                  if failure is None:
+                      failure = case.find("error")
+                  if failure is not None:
                       name = case.get("classname", "") + "::" + case.get("name", "")
-                      name = name.replace("%", "%25").replace("\r", "%0D").replace("\n", "%0A")
-                      print("::error title=Failed release test::" + name)
+                      detail = failure.get("message", "")[:2000]
+                      message = name + "\n" + detail
+                      message = message.replace("%", "%25").replace("\r", "%0D").replace("\n", "%0A")
+                      print("::error title=Failed release test::" + message)
           PY