Use ctest --output-on-failure to avoid extraneous output

.ci/gitlab-ci.yml

@@ -130,7 +130,7 @@ build-docs:
     - cmake ../ -DCMAKE_CXX_COMPILER=${CXX_COMPILER} -DCPACK_DEBIAN_PACKAGE_RELEASE="$(lsb_release -sc)" -DCMAKE_BUILD_TYPE=$BUILD_TYPE -DGTIRB_STRIP_DEBUG_SYMBOLS=On -DGTIRB_RELEASE_VERSION=$RELEASE_VERSION -DGTIRB_PACKAGE_POLICY=$PACKAGE_POLICY
     - make -j
     - pip3 install -e python
-    - ctest -V
+    - ctest --output-on-failure
 
 build-ubuntu20-gcc:
   stage: build
@@ -175,7 +175,7 @@ build-static:
     - cd build
     - cmake ../ -DGTIRB_BUILD_SHARED_LIBS=OFF -DGTIRB_PY_API=OFF
     - make -j
-    - ctest -V
+    - ctest --output-on-failure
     # ensure that we produced a .a file instead of a .so
     - '[ -e lib/libgtirb.a ]'
     - '[ ! -e lib/libgtirb.so ]'
@@ -204,7 +204,7 @@ coverage:
     - cmake -DENABLE_CODE_COVERAGE=ON ..
     - cmake --build .
     - pip3 install -e python
-    - ctest -V
+    - ctest --output-on-failure
     - gcovr --exclude=googletest-src --exclude=doc --exclude=..*/proto --exclude=..*/test --root ..
     - cd python
     - coverage report --omit=gtirb/proto/* --show-missing