Use `pull_request_target` for triage workflow (#372) #1628

	name: Ubuntu CI

	on: [push, pull_request]

	jobs:
	focal-ci:
	runs-on: ubuntu-latest
	name: Ubuntu Focal CI
	steps:
	- name: Checkout
	uses: actions/checkout@v3
	- name: Compile and test
	id: ci
	uses: gazebo-tooling/action-gz-ci@focal
	with:
	cmake-args: '-DBUILDSYSTEM_TESTING=True'
	jammy-ci:
	runs-on: ubuntu-latest
	name: Ubuntu Jammy CI
	steps:
	- name: Checkout
	uses: actions/checkout@v3
	- name: Compile and test
	id: ci
	uses: gazebo-tooling/action-gz-ci@jammy
	with:
	cmake-args: '-DBUILDSYSTEM_TESTING=True -DGZ_ENABLE_RELOCATABLE_INSTALL=True'

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