Adds test and lint workflows

.github/workflows/lint.yaml

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+name: Lint
+
+on:
+  workflow_call:
+    inputs:
+      package_path:
+        type: string
+        required: false
+        default: ''
+        description: "Specifies a subpath of the checkout that the package is contained in."
+
+jobs:
+  format:
+    name: Format linting
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Pull formatting docker image
+        run: docker pull ghcr.io/nicklockwood/swiftformat:latest
+      - name: Run format linting
+        run: docker run --rm -v ${{ github.workspace }}:/repo ghcr.io/nicklockwood/swiftformat:latest /repo/${{ inputs.package_path }} --lint

.github/workflows/self-test.yaml

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+name: Self-test the CI workflows
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  lint:
+    uses: ./.github/workflows/lint.yaml
+    with:
+      package_path: WorkflowTestPackage
+  test:
+    uses: ./.github/workflows/test.yaml
+    with:
+      package_path: WorkflowTestPackage

.github/workflows/test.yaml

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+name: Test
+
+on:
+  workflow_call:
+    inputs:
+      package_path:
+        type: string
+        required: false
+        default: ''
+        description: "Specifies a subpath of the checkout that the package is contained in."
+
+env:
+  PACKAGE_PATH: ${{ inputs.package_path != '' && format('--package-path={0}', inputs.package_path) || '' }}
+
+jobs:
+  macos:
+    name: Test on macOS
+    runs-on: macos-latest
+    steps:
+    - uses: maxim-lobanov/setup-xcode@v1
+      with:
+        xcode-version: latest-stable
+    - uses: actions/checkout@v4
+    - name: Build and test
+      run: |
+        swift test \
+          --parallel \
+          ${{ inputs.package_path != '' && format('--package-path={0}', inputs.package_path) || '' }}
+
+  linux:
+    name: Test on Linux - ${{ matrix.swift-image }}
+    strategy:
+      matrix:
+        swift-image:
+          - "swift:5.8-jammy"
+          - "swift:5.9-jammy"
+          - "swift:5.10-jammy"
+          - "swift:5.10-noble"
+          - "swift:6.0-jammy"
+          - "swift:6.0-noble"
+    runs-on: ubuntu-latest
+    container: ${{ matrix.swift-image }}
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+    - name: Test
+      run: |
+        swift test \
+          --parallel \
+          ${{ inputs.package_path != '' && format('--package-path={0}', inputs.package_path) || '' }}
+
+  android:
+    name: Test on Android
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Test
+      uses: skiptools/swift-android-action@v2
+      with:
+        package-path: ${{ inputs.package_path != '' && inputs.package_path || '.' }}

WorkflowTestPackage/.gitignore

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+.DS_Store
+/.build
+/Packages
+xcuserdata/
+DerivedData/
+.swiftpm/configuration/registries.json
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
+.netrc

WorkflowTestPackage/Package.swift

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+// swift-tools-version:5.8
+
+import PackageDescription
+
+let package = Package(
+    name: "WorkflowTestPackage",
+    products: [
+        .library(
+            name: "WorkflowTestPackage",
+            targets: ["WorkflowTestPackage"]
+        ),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
+        .target(
+            name: "WorkflowTestPackage"
+        ),
+        .testTarget(
+            name: "WorkflowTestPackageTests",
+            dependencies: ["WorkflowTestPackage"]
+        ),
+    ]
+)

WorkflowTestPackage/Sources/WorkflowTestPackage/WorkflowTestPackage.swift

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+public struct WorkflowTest {
+    public let foo = "bar"
+
+    public init() {}
+
+    public func hello() -> String {
+        return "world"
+    }
+}

WorkflowTestPackage/Tests/WorkflowTestPackageTests/WorkflowTestPackageTests.swift

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+@testable import WorkflowTestPackage
+
+import XCTest
+
+class WorkflowTestPackageTests: XCTestCase {
+    func testHello() async throws {
+        XCTAssertEqual(WorkflowTest().hello(), "world")
+    }
+}