Add static SDK CI workflow

Author: rnro

.github/workflows/main.yml

@@ -16,3 +16,8 @@ jobs:
       linux_6_0_arguments_override: "--explicit-target-dependency-import-check error"
       linux_nightly_next_arguments_override: "--explicit-target-dependency-import-check error"
       linux_nightly_main_arguments_override: "--explicit-target-dependency-import-check error"
+
+  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

@@ -45,3 +45,8 @@ jobs:
     with:
       name: "Cxx interop"
       matrix_string: '${{ needs.construct-cxx-matrix.outputs.cxx-interop-matrix }}'
+
+  static-sdk:
+    name: Static SDK
+    # Workaround https://github.com/nektos/act/issues/1875
+    uses: apple/swift-nio/.github/workflows/static_sdk.yml@main