add signal handler for SIGINT and SIGTERM. #22

	# This is workflow for iron distribution
	name: iron

	# Currently ros2ai supports all distribution with rolling branch, this is intentionally done.
	# Unless it becomes necessary, we will keep the rolling branch for every distribution.
	# So that we do not have, dependencies, backport, these maintenance extra cost.
	on:
	push:
	branches: [ "rolling" ]
	pull_request:
	branches: [ "rolling" ]

	# Allows you to run this workflow manually from the Actions tab
	workflow_dispatch:

	# A workflow run is made up of one or more jobs that can run sequentially or in parallel
	jobs:

	# each job goes for each ros supported distribution.
	# each job description absorb the distribution dependency as much as possible,
	# so that build verification script can be agnostic from distribution dependency.

	build:
	runs-on: ubuntu-latest
	container:
	image: ros:iron
	env:
	ROS_DISTRO: iron
	steps:
	- name: Check out repository code
	uses: actions/checkout@v3
	- name: Build with ROS iron
	shell: bash
	run: \|
	./scripts/github_workflows.sh

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