[ci] Add gazebo docker build #4

	# https://help.github.com/en/articles/workflow-syntax-for-github-actions

	name: CI Downstream

	on:
	push:
	branches:
	- "**"
	paths-ignore:
	- ".github/workflows/cache_*.yml"
	- "docker/dev/**"
	pull_request:
	branches:
	- "**"
	paths-ignore:
	- ".github/workflows/cache_*.yml"
	- "docker/dev/**"
	schedule:
	# Cron syntax: [minute hour day_of_the_month month day_of_the_week]
	- cron: "0 2 * * 0,3" # Run every Sunday and Wednesday at 02:00
	workflow_dispatch:

	env:
	DOCKER_REPO: jslee02/dart-dev # https://hub.docker.com/repository/docker/jslee02/dart-dev

	jobs:
	tracy:
	name: gazebo
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	dart_version: [v6.14]
	build_min: [ON]
	env:
	OS_VERSION: gazebo
	DART_VERSION: ${{ matrix.dart_version }}
	steps:
	# https://github.com/marketplace/actions/docker-setup-qemu
	- name: Set up QEMU
	uses: docker/setup-qemu-action@v3
	# https://github.com/marketplace/actions/docker-setup-buildx
	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v3
	# https://github.com/marketplace/actions/docker-login
	- name: Login to DockerHub
	uses: docker/login-action@v3
	with:
	username: ${{ secrets.DOCKER_USERNAME }}
	password: ${{ secrets.DOCKER_PASSWORD }}
	# https://github.com/marketplace/actions/build-and-push-docker-images
	- name: Build and push
	id: docker_build
	uses: docker/build-push-action@v5
	with:
	file: ./docker/dev/${{ env.DART_VERSION }}/Dockerfile.${{ env.OS_VERSION }}
	push: true
	tags: ${{ env.DOCKER_REPO }}:${{ env.OS_VERSION }}-${{ env.DART_VERSION }}
	- name: Image digest
	run: echo ${{ steps.docker_build.outputs.digest }}

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