Use Swiftlang's GitHUb workflow for testing with Static SDK (#613)

Use Swiftlang's GitHub workflow script to test with the static SDK

---------

Co-authored-by: Sebastien Stormacq <stormacq@amazon.lu>

.github/workflows/pull_request.yml

@@ -59,16 +59,10 @@ jobs:
       - name: Check for Semantic Version label
         uses: apple/swift-nio/.github/actions/pull_request_semver_label_checker@main
 
-  # until there is a support for musl in swiftlang/github-workflows
-  # https://github.com/swiftlang/github-workflows/issues/34
   musl:
-    runs-on: ubuntu-latest
-    container: swift:6.0.2-noble
-    timeout-minutes: 30
-    steps:
-      - name: Check out code
-        uses: actions/checkout@v4
-      - name: Install SDK
-        run: swift sdk install https://download.swift.org/swift-6.0.2-release/static-sdk/swift-6.0.2-RELEASE/swift-6.0.2-RELEASE_static-linux-0.0.1.artifactbundle.tar.gz --checksum aa5515476a403797223fc2aad4ca0c3bf83995d5427fb297cab1d93c68cee075
-      - name: Build
-        run: swift build --swift-sdk x86_64-swift-linux-musl
+    name: Linux Static SDK (musl) Test
+    uses: swiftlang/github-workflows/.github/workflows/swift_package_test.yml@main
+    with:
+      enable_linux_checks: false
+      enable_linux_static_sdk_build: true
+      enable_windows_checks: false