Enable amazonlinux2 in pull_request.yml (#227)

Due to frequent regressions with Amazon Linux 2 we should test it on CI.

Author: MaxDesiatov

.github/workflows/pull_request.yml

@@ -9,8 +9,18 @@ jobs:
     name: Test
     uses: swiftlang/github-workflows/.github/workflows/swift_package_test.yml@main
     with:
-      linux_pre_build_command: apt-get update && apt-get install -y locales locales-all libsqlite3-dev
+      linux_os_versions: '["amazonlinux2", "bookworm", "jammy", "focal", "noble", "rhel-ubi9"]'
+      linux_swift_versions: '["6.0", "6.1", "nightly-6.2", "nightly-main"]'
+      linux_pre_build_command: |
+        if command -v apt-get >/dev/null 2>&1 ; then # bookworm, noble, jammy, focal
+          apt-get update -y
+          apt-get install -y locales locales-all libsqlite3-dev
+        elif command -v yum >/dev/null 2>&1 ; then # amazonlinux2, rhel-ubi9
+          yum update -y
+          yum install -y sqlite-devel
+        fi
       enable_windows_checks: false
+
   soundness:
     name: Soundness
     uses: swiftlang/github-workflows/.github/workflows/soundness.yml@main