Upgrade to Go 1.21 (#78) #224

	name: build

	on:
	push:
	branches:
	- main
	tags:
	- v**
	pull_request:
	branches: [main]

	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2

	- name: Determine Version
	run: \|
	# determine version from tag
	export VERSION=$(echo "${GITHUB_REF}" \| cut -d "/" -f3)
	if [[ $VERSION != v* ]]
	then
	export VERSION=""
	echo "Building version-less (main or feature branch)"
	else
	# make version more Docker-friendly by dropping the 'v'
	export VERSION=${VERSION:1:${#VERSION}}
	echo "Building as ${VERSION}"
	fi
	echo "##[set-output name=version;]$VERSION"
	id: determine_version

	- name: Set up Go
	uses: actions/setup-go@v2
	with:
	go-version: 1.21

	- name: Lint
	run: go vet ./...

	- name: Build
	run: go build ./...

	- name: Test
	run: go test -v -coverprofile=coverage.cov -coverpkg ./... -covermode=atomic ./...

	- uses: codecov/codecov-action@v2.1.0
	with:
	files: coverage.cov
	flags: unittests

	- name: Push Release Docker Image
	run: \|
	echo "${{ secrets.GITHUB_TOKEN }}" \| docker login ghcr.io -u ${{ github.actor }} --password-stdin
	docker build -t ghcr.io/oxisto/oauth2go:latest .
	docker tag ghcr.io/oxisto/oauth2go:latest ghcr.io/oxisto/oauth2go:$VERSION
	docker push ghcr.io/oxisto/oauth2go:$VERSION
	docker push ghcr.io/oxisto/oauth2go:latest
	if: startsWith(github.ref, 'refs/tags/v')
	env:
	VERSION: ${{ steps.determine_version.outputs.version }}

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