message: Issue ADDITIONAL_CMAKE_OPTIONS from CI environment ignored
  ADDITIONAL_CMAKE_OPTIONS setup as environment variable in CI were being
  ignored. This was a formatting issue (GHA tends to be picky about the
  quotes).
diff: @@ -73,7 +73,7 @@ jobs:
  run: |
  echo 'PATH=/usr/lib/ccache:'"$PATH" >> $GITHUB_ENV
  echo 'PREFIX=${GITHUB_WORKSPACE}/install' >> $GITHUB_ENV
  - echo "ADDITIONAL_CMAKE_OPTIONS='-DPython3_ROOT_DIR=${pythonLocation} -DMY_CXX_WARNING_FLAGS="-W -Wall -Wextra -Wno-unused-parameter -Wno-unused-variable -Werror -UNDEBUG"'" >> $GITHUB_ENV
  + echo "ADDITIONAL_CMAKE_OPTIONS=-DPython3_ROOT_DIR=${pythonLocation} -DMY_CXX_WARNING_FLAGS='-W -Wall -Wextra -Wno-unused-parameter -Wno-unused-variable -Werror -UNDEBUG'" >> $GITHUB_ENV
  echo "CMAKE_GENERATOR=Ninja" >> $GITHUB_ENV
  - name: Show shell configuration
  @@ -179,7 +179,7 @@ jobs:
  echo 'CXX=g++-9' >> $GITHUB_ENV
  echo 'PATH=/usr/lib/ccache:'"$PATH" >> $GITHUB_ENV
  echo 'PREFIX=${GITHUB_WORKSPACE}/install' >> $GITHUB_ENV
  - echo "ADDITIONAL_CMAKE_OPTIONS='-DPython3_ROOT_DIR=${pythonLocation} -DMY_CXX_WARNING_FLAGS="-W -Wall -Wextra -Wno-unused-parameter -Wno-unused-variable -Werror -UNDEBUG"'" >> $GITHUB_ENV
  + echo "ADDITIONAL_CMAKE_OPTIONS=-DPython3_ROOT_DIR=${pythonLocation} -DMY_CXX_WARNING_FLAGS='-W -Wall -Wextra -Wno-unused-parameter -Wno-unused-variable -Werror -UNDEBUG'" >> $GITHUB_ENV
  echo "CMAKE_GENERATOR=Ninja" >> $GITHUB_ENV
  - name: Show shell configuration
  