diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..bf8ab65
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,30 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: blacksmith-2vcpu-ubuntu-2204
+    steps:
+      - name: Check out the repository
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+          cache: true
+
+      - name: Lint
+        run: make lint
+
+      - name: Test
+        run: make test
diff --git a/Makefile b/Makefile
index 50a4854..6a6565a 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,12 @@ format:
 	gofmt -w .
 
 lint:
-	gofmt -l . | tee /dev/stderr | (! read)
+	@unformatted=$$(gofmt -l .); \
+	if [ -n "$$unformatted" ]; then \
+		echo "these files are not gofmt'ed:"; \
+		echo "$$unformatted"; \
+		exit 1; \
+	fi
 	go vet ./...
 
 test: