Only run swift build

Author: shahmishal

.github/workflows/pull_request.yml

@@ -8,6 +8,9 @@ jobs:
   tests:
     name: Test
     uses: swiftlang/github-workflows/.github/workflows/swift_package_test.yml@main
+    with:
+      linux_build_command: "swift build"
+      windows_build_command: "swift build"
   soundness:
     name: Soundness
     uses: swiftlang/github-workflows/.github/workflows/soundness.yml@main