[CI] attempt to add CI action to test with disabled package traits

Author: ktoso

.github/workflows/main.yml

@@ -17,6 +17,21 @@ jobs:
             linux_nightly_next_arguments_override: "--explicit-target-dependency-import-check error"
             linux_nightly_main_arguments_override: "--explicit-target-dependency-import-check error"
 
+    unit-tests-no-package-traits:
+        name: 'Unit tests (disable default package traits)'
+        uses: apple/swift-nio/.github/workflows/unit_tests.yml@main
+        with:
+            linux_6_1_arguments_override: "--explicit-target-dependency-import-check error -Xswiftc -warnings-as-errors --disable-default-traits"
+            linux_5_9_enabled: false
+            linux_nightly_6_0_enabled: false
+            linux_nightly_6_1_enabled: false
+            linux_nightly_next_enabled: false
+            linux_nightly_main_enabled: false
+            windows_6_0_enabled: false
+            windows_6_1_enabled: false
+            windows_nightly_6_0_enabled: false
+            windows_nightly_6_1_enabled: false
+
     static-sdk:
         name: Static SDK
         # Workaround https://github.com/nektos/act/issues/1875