Use norionomura/action-swiftlint@master as GitHub Action

.github/workflows/swiftlint.yml

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+name: SwiftLint
+
+on:
+  pull_request:
+    paths:
+      - '.github/workflows/swiftlint.yml'
+      - '.swiftlint.yml'
+      - '**/*.swift'
+
+jobs:
+  SwiftLint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - name: GitHub Action for SwiftLint
+        uses: norio-nomura/action-swiftlint@master

.gitignore

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+.DS_Store
+/.build
+/Packages
+/*.xcodeproj

Package.swift

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+// swift-tools-version:4.2
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "test-action-swiftlint",
+    products: [
+        // Products define the executables and libraries produced by a package, and make them visible to other packages.
+        .library(
+            name: "test-action-swiftlint",
+            targets: ["test-action-swiftlint"]),
+    ],
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages which this package depends on.
+        .target(
+            name: "test-action-swiftlint",
+            dependencies: []),
+        .testTarget(
+            name: "test-action-swiftlintTests",
+            dependencies: ["test-action-swiftlint"]),
+    ]
+)

README.md

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+# test-action-swiftlint
+
+A description of this package.

Sources/test-action-swiftlint/test_action_swiftlint.swift

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+struct test_action_swiftlint {
+    var text = "Hello, World!"
+}

Tests/LinuxMain.swift

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+import XCTest
+
+import test_action_swiftlintTests
+
+var tests = [XCTestCaseEntry]()
+tests += test_action_swiftlintTests.allTests()
+XCTMain(tests)

Tests/test-action-swiftlintTests/XCTestManifests.swift

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+import XCTest
+
+#if !os(macOS)
+public func allTests() -> [XCTestCaseEntry] {
+    return [
+        testCase(test_action_swiftlintTests.allTests),
+    ]
+}
+#endif

Tests/test-action-swiftlintTests/test_action_swiftlintTests.swift

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+import XCTest
+@testable import test_action_swiftlint
+
+final class test_action_swiftlintTests: XCTestCase {
+    func testExample() {
+        // This is an example of a functional test case.
+        // Use XCTAssert and related functions to verify your tests produce the correct
+        // results.
+        XCTAssertEqual(test_action_swiftlint().text, "Hello, World!")
+    }
+
+    static var allTests = [
+        ("testExample", testExample),
+    ]
+}