Add enable_wasm_sdk_build: true to pull_request.yml (#261)

Author: MaxDesiatov

.github/workflows/pull_request.yml

@@ -21,6 +21,8 @@ jobs:
   tests:
     name: Test
     uses: swiftlang/github-workflows/.github/workflows/swift_package_test.yml@main
+    with:
+      enable_wasm_sdk_build: true
 
   soundness:
     name: Soundness