Restore amazon linux 2 as the release build platform

Author: cmcgee1024

.github/workflows/pull_request.yml

@@ -23,8 +23,7 @@ jobs:
     name: Test
     uses: swiftlang/github-workflows/.github/workflows/swift_package_test.yml@main
     with:
-      # Amazon Linux 2 won't work with GH infrastructure
-      linux_os_versions: "[\"jammy\", \"focal\", \"rhel-ubi9\", \"noble\", \"bookworm\", \"fedora39\"]"
+      linux_os_versions: "[\"jammy\", \"focal\", \"rhel-ubi9\", \"noble\", \"bookworm\", \"fedora39\", \"amazonlinux2\"]"
       # We only care about the current stable release, because that's where we make our swiftly releases
       linux_exclude_swift_versions: "[{\"swift_version\": \"nightly-main\"},{\"swift_version\": \"nightly-6.0\"},{\"swift_version\": \"5.8\"},{\"swift_version\": \"5.9\"},{\"swift_version\": \"5.10\"}]"
       linux_pre_build_command: ./scripts/prep-gh-action.sh && ./scripts/install-libarchive.sh
@@ -34,7 +33,7 @@ jobs:
     name: Release Build Check
     runs-on: ubuntu-latest
     container:
-      image: "swift:6.0-rhel-ubi9"
+      image: "swift:6.0-amazonlinux2"
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4

Tools/build-swiftly-release/BuildSwiftlyRelease.swift

@@ -126,7 +126,7 @@ public func getShell() async throws -> String {
 }
 #endif
 
-public func isRHEL9() -> Bool {
+public func isAmazonLinux2() -> Bool {
     let osReleaseFiles = ["/etc/os-release", "/usr/lib/os-release"]
     var releaseFile: String?
     for file in osReleaseFiles {
@@ -165,7 +165,7 @@ public func isRHEL9() -> Bool {
         return false
     }
 
-    guard let versionID, versionID.hasPrefix("9"), (id + idlike).contains("rhel") else {
+    guard let versionID = versionID, versionID == "2", (id + idlike).contains("amzn") else {
         return false
     }
 
@@ -287,7 +287,7 @@ struct BuildSwiftlyRelease: AsyncParsableCommand {
 
     func buildLinuxRelease() async throws {
         // Check system requirements
-        guard isRHEL9() else {
+        guard isAmazonLinux2() else {
             // TODO: see if docker can be used to spawn an Amazon Linux 2 container to continue the release building process
             throw Error(message: "Linux releases must be made from Amazon Linux 2 because it has the oldest version of glibc for maximum compatibility with other versions of Linux")
         }