Add GH lint workflow

.github/workflows/golangci-lint.yml

@@ -0,0 +1,25 @@
+name: golangci-lint
+on:
+  workflow_dispatch:
+  pull_request:
+
+permissions:
+  contents: read
+  pull-requests: read
+
+jobs:
+  golangci:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-go@v4
+        with:
+          go-version: "stable"
+          cache: false
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v3
+        with:
+          version: v1.54
+          only-new-issues: true
+          args: --timeout=10m

.golangci.yml

@@ -0,0 +1,15 @@
+run:
+  # Enables skipping of directories:
+  # - vendor$, third_party$, testdata$, examples$, Godeps$, builtin$
+  skip-dirs-use-default: true
+  skip-dirs:
+    - internal/gopher-lua
+    - internal/cronexpr
+
+linters:
+  enable:
+    - gofmt
+
+linters-settings:
+  gofmt:
+    simplify: false