Replace buildkite with GHA #5

	name: ci
	on:
	pull_request:
	permissions:
	contents: read
	jobs:
	golangci:
	name: lint
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-go@v4
	- uses: arduino/setup-protoc@v2
	- run: make ci-build
	- name: Fail if the repo is dirty
	run: \|
	buf --version
	if [[ -n $(git status --porcelain) ]]; then
	echo "Detected uncommitted changes."
	git status
	git diff
	exit 1
	fi

Provide feedback