Add CI workflow for Go tests #1

	name: CI
	on:
	push:
	branches:
	- main
	pull_request:
	permissions:
	contents: read
	jobs:
	test:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v4
	- name: Set up Go
	uses: actions/setup-go@v5
	with:
	go-version-file: go.mod
	- name: Verify dependencies
	run: go mod verify
	- name: Check formatting
	run: \|
	unformatted=$(gofmt -l .)
	if [ -n "$unformatted" ]; then
	echo "These files need gofmt:"
	echo "$unformatted"
	exit 1
	fi
	- name: Vet
	run: go vet ./...
	- name: Build
	run: go build ./...
	- name: Test (race + coverage)
	run: go test -race -timeout 120s -coverprofile=coverage.out ./...

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