Add static SDK CI workflow (#234)

Add static SDK CI workflow which runs on commits to PRs, merges to main
and daily on main.

---------

Co-authored-by: Cory Benfield <lukasa@apple.com>

Author: rnro

.github/workflows/main.yml

@@ -26,3 +26,8 @@ jobs:
   cxx-interop:
     name: Cxx interop
     uses: apple/swift-nio/.github/workflows/cxx_interop.yml@main
+
+  static-sdk:
+    name: Static SDK
+    # Workaround https://github.com/nektos/act/issues/1875
+    uses: apple/swift-nio/.github/workflows/static_sdk.yml@main

.github/workflows/pull_request.yml

@@ -37,3 +37,8 @@ jobs:
   cxx-interop:
     name: Cxx interop
     uses: apple/swift-nio/.github/workflows/cxx_interop.yml@main
+
+  static-sdk:
+    name: Static SDK
+    # Workaround https://github.com/nektos/act/issues/1875
+    uses: apple/swift-nio/.github/workflows/static_sdk.yml@main

Sources/X509/Verifier/ServerIdentityPolicy.swift

@@ -14,7 +14,6 @@
 
 #if canImport(FoundationEssentials)
 import FoundationEssentials
-import Glibc
 #else
 import Foundation
 #endif
@@ -23,6 +22,10 @@ import SwiftASN1
 import WinSDK
 #elseif canImport(Android)
 import Android
+#elseif canImport(Glibc)
+import Glibc
+#elseif canImport(Musl)
+import Musl
 #endif
 
 /// A ``VerifierPolicy`` that validates that the leaf certificate is authoritative