add small sanitizer test run to MR pipeline

      - out/logs

run-selftest-with-msan:

  extends: .test-job-linux

  stage: test

  needs: [ "build-codec-sanitizers-linux" ]

  rules:

    - if: $CI_PIPELINE_SOURCE == 'merge_request_event'

  script:

    - make clean

    - make -j CLANG=1

    - python3 scripts/self_test.py --create | tee test_output.txt

    - run_errors=$(cat test_output.txt | grep -c "test conditions had run errors") || true

    - if [ $run_errors != 0 ] ; then echo "Run errors in self_test.py with Clang memory-sanitizer"; exit $EXIT_CODE_FAIL; fi

# compare bit exactness between target and source branch

self-test-on-merge-request:

  extends: .test-job-linux