Add GitHub Action workflows which build main branch (post-merge) (#1361)

Author: stmontgomery

.github/workflows/main_using_main.yml

@@ -0,0 +1,22 @@
+name: main branch, main toolchain
+
+on:
+  push:
+    branches:
+      - 'main'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  tests:
+    name: Test
+    uses: swiftlang/github-workflows/.github/workflows/swift_package_test.yml@main
+    with:
+      linux_swift_versions: '["nightly-main"]'
+      linux_os_versions: '["amazonlinux2", "jammy"]'
+      windows_swift_versions: '["nightly-main"]'
+      enable_macos_checks: true
+      macos_exclude_xcode_versions: '[{"xcode_version": "16.2"}, {"xcode_version": "16.3"}, {"xcode_version": "16.4"}]'
+      enable_wasm_sdk_build: true

.github/workflows/main_using_release.yml

@@ -0,0 +1,22 @@
+name: main branch, 6.2 toolchain
+
+on:
+  push:
+    branches:
+      - 'main'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  tests:
+    name: Test
+    uses: swiftlang/github-workflows/.github/workflows/swift_package_test.yml@main
+    with:
+      linux_swift_versions: '["nightly-6.2"]'
+      linux_os_versions: '["amazonlinux2", "jammy"]'
+      windows_swift_versions: '["nightly-6.2"]'
+      enable_macos_checks: true
+      macos_exclude_xcode_versions: '[{"xcode_version": "16.2"}, {"xcode_version": "16.3"}, {"xcode_version": "16.4"}]'
+      enable_wasm_sdk_build: true

.github/workflows/pull_request.yml

@@ -17,7 +17,7 @@ jobs:
       linux_os_versions: '["amazonlinux2", "jammy"]'
       windows_swift_versions: '["nightly-main", "nightly-6.2"]'
       enable_macos_checks: true
-      macos_exclude_xcode_versions: "[{\"xcode_version\": \"16.2\"}, {\"xcode_version\": \"16.3\"}, {\"xcode_version\": \"16.4\"}]"
+      macos_exclude_xcode_versions: '[{"xcode_version": "16.2"}, {"xcode_version": "16.3"}, {"xcode_version": "16.4"}]'
       enable_wasm_sdk_build: true
   soundness:
     name: Soundness