Add GH Action for build workflow #4

	name: Build Nginx for Heroku Stacks

	on:
	push:
	branches:
	- master
	workflow_dispatch:

	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	target: [heroku-20, heroku-22, heroku-24]
	arch: [amd64, arm64]

	steps:
	- name: Checkout repository
	uses: actions/checkout@v3

	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v2

	- name: Run Makefile target
	run: \|
	if [[ "${{ matrix.target }}" == "heroku-24" ]]; then
	make build-${{ matrix.target }}-${{ matrix.arch }}
	else
	make build-${{ matrix.target }}
	fi

	- name: Upload artifact
	uses: actions/upload-artifact@v3
	with:
	name: \|
	${{ matrix.target }}${{ (matrix.target == 'heroku-24' && '-' \|\| '') }}${{ matrix.arch }}.tgz
	path: \|
	nginx-${{ matrix.target }}${{ (matrix.target == 'heroku-24' && '-' \|\| '') }}${{ matrix.arch }}.tgz


	commit:
	runs-on: ubuntu-latest
	needs: build
	steps:
	- name: Checkout repository
	uses: actions/checkout@v3

	- name: Download build artifacts
	uses: actions/download-artifact@v3

	- name: Commit and push artifacts
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	run: \|
	git config --local user.email "[email protected]"
	git config --local user.name "GitHub Action"
	mkdir -p builds/
	mv *.tgz builds/
	git add builds/*.tgz
	git commit -m "Add nginx builds for Heroku stacks on multiple architectures"
	git push

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