[CI] prevent call to front if empty #33

	name: ROS2 CI

	on:
	push:
	paths-ignore:
	- 'docs/**'
	- 'resources/*'
	pull_request:
	paths-ignore:
	- 'docs/**'
	- 'resources/*'

	jobs:
	build:
	runs-on: ${{ matrix.operating-system }}
	strategy:
	matrix:
	include:
	- operating-system: ubuntu-22.04
	ros_distro: humble
	distro: jammy
	- operating-system: ubuntu-22.04
	ros_distro: iron
	distro: jammy
	env:
	ROS_CI_DESKTOP: ${{ matrix.distro }}
	CI_SOURCE_PATH: $(pwd)
	ROS_DISTRO: ${{ matrix.ros_distro }}
	steps:
	- name: Setup ROS
	uses: ros-tooling/[email protected]
	with:
	required-ros-distributions: ${{ matrix.ros_distro }}

	- name: Install deps
	run: \|
	sudo apt install dpkg
	sudo apt install -y qtbase5-dev qtdeclarative5-dev
	sudo apt install -y libcppunit-dev libcurl4-openssl-dev
	sudo apt-get install python3-rosdep
	sudo apt install ros-cmake-modules
	sudo apt install ros-$ROS_DISTRO-std-msgs ros-$ROS_DISTRO-pluginlib
	source /opt/ros/$ROS_DISTRO/setup.bash

	- name: Setup Workspace
	run: \|
	source /opt/ros/$ROS_DISTRO/setup.bash
	cmake --version
	cd $GITHUB_WORKSPACE
	mkdir -p ros2_ws/src/ontologenius
	cd ros2_ws
	colcon build --symlink-install

	- name: Checkout
	uses: actions/checkout@v4
	with:
	path: ros2_ws/src/ontologenius

	- name: Build
	run: \|
	cd $GITHUB_WORKSPACE/ros2_ws
	source install/setup.bash
	export ROS_LOCALHOST_ONLY=1
	colcon build --symlink-install

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