Add static SDK CI workflow (#823)

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

Author: rnro

.github/workflows/main.yml

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

@@ -23,3 +23,8 @@ 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