github/workflows: add linting workflow (#5)

* github/workflows: add linting workflow

* Hint the linter not to complain about unchecked rollback error

.github/workflows/lint.yaml

@@ -0,0 +1,27 @@
+name: Golangci lint
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+permissions:
+  contents: read
+jobs:
+  golangci:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: 1.21
+        env:
+          GOFLAGS: -mod=mod
+
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v3
+        with:
+          version: latest
+          skip-pkg-cache: true

main.go

@@ -23,7 +23,7 @@ func (d *db) ExecContext(ctx context.Context, query string, args ...any) (_ sql.
 	if err != nil {
 		return nil, fmt.Errorf("failed to begin transaction: %w", err)
 	}
-	defer tx.Rollback(ctx)
+	defer tx.Rollback(ctx) // nolint:errcheck
 
 	_, err = tx.Exec(ctx, query, args...)
 	if err != nil {