improve zset testing, fix race condition in test #132

	name: ci
	on: push

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

	- name: test
	run: make docker-test

	- name: build
	run: make goreleaser-build-static

	- name: build-generator
	run: make docker-build-generator-static

	- name: acceptance-tests
	run: make acceptance-tests

	goreleaser:
	runs-on: ubuntu-latest
	needs:
	- test
	if: startsWith(github.ref, 'refs/tags/v')
	steps:
	- name: checkout
	uses: actions/checkout@v2
	with:
	fetch-depth: 0 # https://github.com/goreleaser/goreleaser-action/issues/56

	- name: goreleaser
	run: \|
	echo "${{ github.token }}" \| docker login https://ghcr.io -u ${GITHUB_ACTOR} --password-stdin
	make release
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

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