Add config for head ref #5

	name: Build and Publish

	on:
	# run it on push to the default repository branch
	push:
	branches: [main]
	# run it during pull request
	pull_request:

	jobs:
	# define job to build and publish docker image
	build-and-push-docker-image:
	name: Build Docker image and push to repositories
	# run only when code is compiling and tests are passing
	runs-on: ubuntu-latest

	# steps to perform in job
	steps:
	- name: Checkout code
	uses: actions/checkout@v2

	- name: Build binary
	run: make

	- name: Login to Github Packages
	uses: docker/login-action@v1
	with:
	registry: ghcr.io
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}

	- name: Build image and push
	uses: docker/build-push-action@v2
	with:
	context: .
	tags: \|
	ghcr.io/kastelo-labs/git-mirror:latest
	# build on feature branches, push only on main branch
	push: ${{ github.ref == 'refs/heads/main' }}

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