Merge branch '3915-check-dig-output-for-errors-9.18' into 'bind-9.18'

[9.18] Find errors in dig output in system tests

See merge request isc-projects/bind9!7769

.gitlab-ci.yml

@@ -323,6 +323,7 @@ stages:
     - REALSOURCEDIR="$PWD"
     - test -n "${OUT_OF_TREE_WORKSPACE}" && cd "${OUT_OF_TREE_WORKSPACE}"
     - cat bin/tests/system/test-suite.log
+    - find bin/tests/system -name "*dig.*" | xargs grep "error"
     - *find_python
     - >
       "$PYTHON" "$REALSOURCEDIR"/bin/tests/convert-trs-to-junit.py . > "$CI_PROJECT_DIR"/junit.xml
@@ -345,6 +346,7 @@ stages:
   <<: *system_test_common
   after_script:
     - cat bin/tests/system/test-suite.log
+    - find bin/tests/system -name "*dig.*" | xargs grep "error"
     - *find_python
     - *parse_tsan
     - >