ci: add GitHub Actions workflow (format/vet/lint/test) (#27) #2

	name: CI

	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]

	jobs:
	ci:
	runs-on: ubuntu-latest

	steps:
	- name: Checkout
	uses: actions/checkout@v4
	with:
	fetch-depth: 0

	- name: Set up Go
	uses: actions/setup-go@v5
	with:
	go-version: '1.25'

	- name: Check formatting
	run: \|
	unformatted=$(gofmt -l .)
	if [ -n "$unformatted" ]; then
	echo "Unformatted files detected:"; echo "$unformatted"; exit 1
	fi

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

	- name: Install golangci-lint
	run: \|
	mkdir -p ./bin
	GOBIN=$(pwd)/bin go install github.com/golangci/golangci-lint/cmd/golangci-lint@latest

	- name: Run golangci-lint (verbose) and save log
	run: \|
	set +e
	mkdir -p artifacts
	./bin/golangci-lint run ./... --verbose > artifacts/golangci.log 2>&1 \|\| true
	rc=$?
	cat artifacts/golangci.log
	echo $rc > artifacts/golangci_exit

	- name: Upload golangci-lint log
	uses: actions/upload-artifact@v4
	with:
	name: golangci-log
	path: artifacts/golangci.log

	- name: Fail if golangci-lint reported issues
	run: \|
	rc=$(cat artifacts/golangci_exit \|\| echo 0)
	if [ "$rc" != "0" ]; then
	echo "golangci-lint failed with exit code $rc"
	exit $rc
	fi

	- name: Tidy modules
	run: go mod tidy

	- name: Build
	run: go build -v -o codewise main.go

	- name: Test
	run: go test ./... -v

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