Add support for Linux on aarch64

Author: jakepetroules

.github/workflows/pull_request.yml

@@ -26,6 +26,7 @@ jobs:
     with:
       # Linux
       linux_os_versions: '["jammy", "rhel-ubi9", "amazonlinux2"]'
+      linux_archs: '["x86_64", "aarch64"]'
       linux_build_command: |
         cd tests/TestPackage
         swift build

.github/workflows/swift_package_test.yml

@@ -50,6 +50,10 @@ on:
         type: string
         description: "Linux OS version list (JSON)"
         default: "[\"jammy\"]"
+      linux_archs:
+        type: string
+        description: "Linux arch list (JSON)"
+        default: "[\"x86_64\"]"
       linux_static_sdk_versions:
         type: string
         description: "Static Linux Swift SDK version list (JSON)"
@@ -297,14 +301,20 @@ jobs:
   linux-build:
     name: Linux (${{ matrix.swift_version }} - ${{ matrix.os_version }})
     if: ${{ inputs.enable_linux_checks }}
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.runner }}
     strategy:
       fail-fast: false
       matrix:
         swift_version: ${{ fromJson(inputs.linux_swift_versions) }}
         os_version: ${{ fromJson(inputs.linux_os_versions) }}
+        arch: ${{ fromJson(inputs.linux_archs) }}
         exclude:
           - ${{ fromJson(inputs.linux_exclude_swift_versions) }}
+        include:
+          - arch: x86_64
+            runner: ubuntu-24.04
+          - arch: aarch64
+            runner: ubuntu-24.04-arm
     container:
       image: ${{ (contains(matrix.swift_version, 'nightly') && 'swiftlang/swift') || 'swift' }}:${{ matrix.swift_version }}-${{ matrix.os_version }}
     steps: