use GITHUB_TOKEN for auth #10

	name: Build and Push Docker Image
	on:
	push:
	branches:
	- master
	jobs:
	build-and-push:
	strategy:
	matrix:
	IMAGE_TAG:
	- msvc
	# - gcc-4.8
	# - latest
	runs-on: ubuntu-latest
	steps:
	- name: Login to GHCR
	uses: docker/login-action@v3
	with:
	registry: ghcr.io
	username: DFHack-Urist
	password: ${{ secrets.GITHUB_TOKEN }}
	# From https://github.com/docker/build-push-action#git-context
	# Setting up Docker Buildx with docker-container driver is required
	# at the moment to be able to use a subdirectory with Git context
	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v3
	- name: Build and push
	uses: docker/build-push-action@v6
	with:
	context: "{{defaultContext}}:${{ matrix.IMAGE_TAG }}"
	push: true
	tags: ghcr.io/${{ env.GHCR_NAMESPACE }}/${{ env.IMAGE_NAME }}:${{ matrix.IMAGE_TAG }}
	env:
	GHCR_NAMESPACE: dfhack
	IMAGE_NAME: build-env

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