use swiftlang CI workflow

add license check

add readme build badge

.github/workflows/pull_request.yaml

@@ -1,32 +1,55 @@
-# This workflow will build a Swift project on macOS and Linux 
+# This workflow will build a Swift project on macOS and Linux
 # For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-swift
 name: swift-openapi-lambda-build
 
 on:
   push:
-    branches: [ "main" ]
+    branches: ["main"]
   pull_request:
     types: [opened, reopened, synchronize]
 
 jobs:
-  build-macos:
-    env:
-      # https://github.com/actions/runner-images/tree/main/images/macos
-      DEVELOPER_DIR: /Applications/Xcode_16.app/Contents/Developer
-      
-    runs-on: macos-15-arm64
-    # runs-on: macos-15
-    steps:
-    - uses: actions/checkout@v4
-    - name: Build
-      run: swift build -v
-    - name: Run tests
-      run: swift test -v
-  build-linux:
+  soundness:
+    name: Soundness
+    uses: swiftlang/github-workflows/.github/workflows/soundness.yml@main
+    with:
+      # do not use SwiftLang's license header check because the copyright for this project is Amazon.com + contributors
+      license_header_check_enabled: false
+      license_header_check_project_name: "Swift OpenAPI Lambda"
+      shell_check_enabled: false
+      python_lint_check_enabled: false
+      api_breakage_check_container_image: "swift:6.0-noble"
+      docs_check_container_image: "swift:6.0-noble"
+      format_check_container_image: "swiftlang/swift:nightly-6.0-jammy"
+
+  license:
+    name: License headers check
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
     steps:
-    - uses: actions/checkout@v4
-    - name: Build
-      run: swift build -v
-    - name: Run tests
-      run: swift test -v
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+      - name: Mark the workspace as safe
+        # https://github.com/actions/checkout/issues/766
+        run: git config --global --add safe.directory ${GITHUB_WORKSPACE}
+      - name: License headers check
+        env:
+          PROJECT_NAME: "Swift OpenAPI Lambda"
+        run: |
+          ./scripts/check-license-headers.sh
+
+  unit-tests:
+    name: Unit tests
+    uses: apple/swift-nio/.github/workflows/unit_tests.yml@main
+    with:
+      linux_5_9_enabled: false
+      linux_5_10_enabled: true
+      linux_nightly_6_0_arguments_override: "--explicit-target-dependency-import-check error"
+      linux_nightly_main_arguments_override: "--explicit-target-dependency-import-check error"
+
+  swift-6-language-mode:
+    name: Swift 6 Language Mode
+    uses: apple/swift-nio/.github/workflows/swift_6_language_mode.yml@main