Add CI pipeline

Fixes #1

.github/workflows/tests.yml

@@ -0,0 +1,18 @@
+# yaml-language-server: $schema=https://json.schemastore.org/github-workflow
+
+name: tests
+
+on:
+  push:
+  workflow_dispatch:
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: stable
+      - run: make ci-test

Makefile

@@ -0,0 +1,29 @@
+all: test
+
+test:
+	go test -v -shuffle=on -coverprofile=coverage.txt -count=1 ./...
+
+vet:
+	go vet ./...
+
+staticcheck:
+	staticcheck ./...
+
+format:
+	gofumpt -l -w .
+
+lint: vet staticcheck format
+
+install-tools:
+	go install mvdan.cc/gofumpt@latest
+	go install honnef.co/go/tools/cmd/staticcheck@latest
+
+ci-checks: lint
+	go mod tidy
+	git diff --exit-code
+
+ci-test: install-tools ci-checks test
+
+# Tell Make that these steps should always run, never cached, even if we have
+# files with the same names as these in the filesystem.
+.PHONY: all test vet staticcheck lint format mod-tidy ci-checks install-tools ci-test