install golangci-lint only if its not installed and update readme #19

	name: pull request checks

	on:
	pull_request:
	branches: ['*']

	jobs:
	build-test:
	name: Build, lint, test
	runs-on: ubuntu-latest
	strategy:
	matrix:
	go: ['1.21', '1.22']

	steps:
	- uses: actions/checkout@v3
	- name: Set up Go
	uses: actions/setup-go@v3
	with:
	go-version: ${{ matrix.go }}
	- name: Install make
	run: sudo apt -y install make
	- name: run build
	run: make build && git diff --exit-code
	- name: run unit tests
	run: make test coverage-report
	- name: Report coverage
	uses: codecov/codecov-action@v2.1.0
	with:
	files: ./cover.out
	flags: unittests
	fail_ci_if_error: true

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