Add reusable workflows

Author: simonjbeaumont

.github/workflows/main.yml

@@ -0,0 +1,22 @@
+name: Main
+
+on:
+  push:
+    branches: [main]
+  schedule:
+    - cron: "0 8,20 * * *"
+
+jobs:
+  unit-tests:
+    name: Unit tests
+    uses: apple/swift-nio/.github/workflows/unit_tests.yml@main
+    with:
+      linux_5_9_arguments_override: "-Xswiftc -warnings-as-errors -Xswiftc -strict-concurrency=complete --explicit-target-dependency-import-check error"
+      # Disable strict concurrency checking as it intersects badly with
+      # warnings-as-errors on 5.10 and later as SwiftPMs generated test manifest
+      # has a non-sendable global property.
+      linux_5_10_arguments_override: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error"
+      # TODO: Enable warnings-as-errors on 6.0.
+      linux_6_0_arguments_override: "-Xswiftc -strict-concurrency=complete --explicit-target-dependency-import-check error"
+      linux_nightly_6_0_arguments_override: "-Xswiftc -strict-concurrency=complete --explicit-target-dependency-import-check error"
+      linux_nightly_main_arguments_override: "-Xswiftc -strict-concurrency=complete --explicit-target-dependency-import-check error"

.github/workflows/pull_request.yml

@@ -0,0 +1,30 @@
+name: PR
+
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+
+jobs:
+  soundness:
+    name: Soundness
+    uses: swiftlang/github-workflows/.github/workflows/soundness.yml@main
+    with:
+      license_header_check_project_name: "SwiftOpenAPIGenerator"
+
+  unit-tests:
+    name: Unit tests
+    uses: apple/swift-nio/.github/workflows/unit_tests.yml@main
+    with:
+      linux_5_9_arguments_override: "-Xswiftc -warnings-as-errors -Xswiftc -strict-concurrency=complete --explicit-target-dependency-import-check error"
+      # Disable strict concurrency checking as it intersects badly with
+      # warnings-as-errors on 5.10 and later as SwiftPMs generated test manifest
+      # has a non-sendable global property.
+      linux_5_10_arguments_override: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error"
+      # TODO: Enable warnings-as-errors on 6.0.
+      linux_6_0_arguments_override: "-Xswiftc -strict-concurrency=complete --explicit-target-dependency-import-check error"
+      linux_nightly_6_0_arguments_override: "-Xswiftc -strict-concurrency=complete --explicit-target-dependency-import-check error"
+      linux_nightly_main_arguments_override: "-Xswiftc -strict-concurrency=complete --explicit-target-dependency-import-check error"
+
+  cxx-interop:
+    name: Cxx interop
+    uses: apple/swift-nio/.github/workflows/cxx_interop.yml@main

.github/workflows/pull_request_label.yml

@@ -0,0 +1,18 @@
+name: PR label
+
+on:
+  pull_request:
+    types: [labeled, unlabeled, opened, reopened, synchronize]
+
+jobs:
+  semver-label-check:
+    name: Semantic Version label check
+    runs-on: ubuntu-latest
+    timeout-minutes: 1
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+      - name: Check for Semantic Version label
+        uses: apple/swift-nio/.github/actions/pull_request_semver_label_checker@main