Add a new CI step to detect raw issue references #1275

	name: Build Docker image

	on:
	push:
	branches:
	- 'master'

	jobs:
	docker:
	runs-on: ubuntu-latest
	steps:
	-
	name: Checkout
	uses: actions/checkout@v3
	-
	name: Set up QEMU
	uses: docker/setup-qemu-action@v2
	-
	name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v2
	-
	name: Login to DockerHub
	uses: docker/login-action@v2
	if: github.repository == 'Rust-GCC/gccrs'
	with:
	username: ${{ secrets.DOCKERHUB_USERNAME }}
	password: ${{ secrets.DOCKERHUB_TOKEN }}
	-
	name: Build and push
	uses: docker/build-push-action@v4
	with:
	context: .
	push: ${{ github.repository == 'Rust-GCC/gccrs' }}
	tags: philberty/gccrs:latest

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