Docker: Install `pyyaml` for `cpp-coveralls`
@@ -138,6 +138,7 @@ RUN virtualenv "${COVERALLS_VIRTUALENV_PATH}" \
&& cd "${COVERALLS_VIRTUALENV_PATH}" \
&& . bin/activate \
&& pip install "urllib3==1.22" \
+ && pip install pyyaml \
&& pip install cpp-coveralls \
&& deactivate
ENV PATH="${PATH}:${COVERALLS_VIRTUALENV_PATH}/bin"
