Update preview.yml #425

	name: Docker Image CI

	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]

	jobs:

	build:

	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v2
	with:
	fetch-depth: 0
	- uses: dotnet/nbgv@master
	id: nbgv
	with:
	setAllVars: true
	- name: Get the repo name (lower case)
	id: get_repo
	uses: ASzc/change-string-case-action@v1
	with:
	string: ${{ github.repository }}
	- name: Login to GitHub Container Registry
	uses: docker/login-action@v1
	with:
	registry: ghcr.io
	username: ${{ github.repository_owner }}
	password: ${{ secrets.GITHUB_TOKEN }}
	- name: Build and Push Docker Image
	uses: docker/build-push-action@v2
	with:
	context: .
	push: ${{ github.event_name != 'pull_request' }} # Will only push image, when not in pull_request
	file: UACloudLibraryServer/Dockerfile
	tags: \|
	ghcr.io/${{ steps.get_repo.outputs.lowercase }}:${{ steps.nbgv.outputs.SemVer2 }}
	ghcr.io/${{ steps.get_repo.outputs.lowercase }}:latest

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