Add ROS_DISTRO environment variable export

Author: Tobias-Fischer

vinca/templates/build_ament_cmake.sh.in

@@ -32,6 +32,8 @@ echo "USING PKG_CONFIG_EXECUTABLE=${PKG_CONFIG_EXECUTABLE}"
 export ROS_PYTHON_VERSION=`$PYTHON_EXECUTABLE -c "import sys; print('%i.%i' % (sys.version_info[0:2]))"`
 echo "Using Python ${ROS_PYTHON_VERSION}"
 
+export ROS_DISTRO="@(ros_distro)"
+
 # see https://github.com/conda-forge/cross-python-feedstock/issues/24
 if [[ "$CONDA_BUILD_CROSS_COMPILATION" == "1" ]]; then
   find $PREFIX/lib/cmake -type f -exec sed -i "s~\${_IMPORT_PREFIX}/lib/python${ROS_PYTHON_VERSION}/site-packages~${BUILD_PREFIX}/lib/python${ROS_PYTHON_VERSION}/site-packages~g" {} + || true