add github actions

.editorconfig

@@ -0,0 +1,12 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.go]
+indent_style = tab

.github/.editorconfig

@@ -0,0 +1,2 @@
+[{*.yml,*.yaml}]
+indent_size = 2

.github/dependabot.yaml

@@ -0,0 +1,12 @@
+version: 2
+
+updates:
+  - package-ecosystem: gomod
+    directory: /
+    schedule:
+      interval: daily
+
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: daily

.github/workflows/ci.yaml

@@ -0,0 +1,48 @@
+name: CI
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        go: ["1.21", "1.22", "1.23"]
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+
+      - name: Set up Go
+        uses: actions/setup-go@3041bf56c941b39c61721a86cd11f3bb1338122a # v5.2.0
+        with:
+          go-version: ${{ matrix.go }}
+
+      - name: Test
+        # Cannot enable shuffle for now because some tests rely on global state and order
+        # run: go test -race -v -shuffle=on ./...
+        run: go test -race -v ./...
+
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+
+      - name: Set up Go
+        uses: actions/setup-go@3041bf56c941b39c61721a86cd11f3bb1338122a # v5.2.0
+        with:
+          go-version: "1.23"
+
+      - name: Lint
+        uses: golangci/golangci-lint-action@971e284b6050e8a5849b72094c50ab08da042db8 # v6.1.1
+        with:
+          version: v1.63.4

.golangci.yaml

@@ -0,0 +1,4 @@
+linters:
+    disable-all: true
+    enable:
+        - nolintlint

flag_test.go

@@ -433,7 +433,7 @@ func testParseWithUnknownFlags(f *FlagSet, t *testing.T) {
 		"-u=unknown3Value",
 		"-p",
 		"unknown4Value",
-		"-q", //another unknown with bool value
+		"-q", // another unknown with bool value
 		"-y",
 		"ee",
 		"--unknown7=unknown7value",
@@ -899,7 +899,7 @@ func TestChangingArgs(t *testing.T) {
 
 // Test that -help invokes the usage message and returns ErrHelp.
 func TestHelp(t *testing.T) {
-	var helpCalled = false
+	helpCalled := false
 	fs := NewFlagSet("help test", ContinueOnError)
 	fs.Usage = func() { helpCalled = true }
 	var flag bool
@@ -998,6 +998,7 @@ func getDeprecatedFlagSet() *FlagSet {
 	f.MarkDeprecated("badflag", "use --good-flag instead")
 	return f
 }
+
 func TestDeprecatedFlagInDocs(t *testing.T) {
 	f := getDeprecatedFlagSet()
 
@@ -1134,7 +1135,6 @@ func TestMultipleNormalizeFlagNameInvocations(t *testing.T) {
 	}
 }
 
-//
 func TestHiddenFlagInUsage(t *testing.T) {
 	f := NewFlagSet("bob", ContinueOnError)
 	f.Bool("secretFlag", true, "shhh")
@@ -1149,7 +1149,6 @@ func TestHiddenFlagInUsage(t *testing.T) {
 	}
 }
 
-//
 func TestHiddenFlagUsage(t *testing.T) {
 	f := NewFlagSet("bob", ContinueOnError)
 	f.Bool("secretFlag", true, "shhh")
@@ -1239,7 +1238,7 @@ func TestPrintDefaults(t *testing.T) {
 	got := buf.String()
 	if got != defaultOutput {
 		fmt.Println("\n" + got)
-		fmt.Println("\n" + defaultOutput)
+		fmt.Printf("\n" + defaultOutput)
 		t.Errorf("got %q want %q\n", got, defaultOutput)
 	}
 }