[Preset] Add preset for swiftpm pull request testing

Author: shahmishal

utils/build-presets.ini

@@ -896,6 +896,30 @@ skip-test-ios
 skip-test-tvos
 skip-test-osx
 
+
+#===------------------------------------------------------------------------===#
+# Test swiftPM on macOS builder
+#===------------------------------------------------------------------------===#
+
+[preset: buildbot_swiftpm_macos_platform,tools=RA,stdlib=RA]
+mixin-preset=buildbot_incremental_base
+
+build-subdir=buildbot_incremental
+
+# Build Release without debug info, because it is faster to build.
+release
+assertions
+
+# Build llbuild & swiftpm here
+llbuild
+swiftpm
+
+dash-dash
+
+# Only run watchOS tests
+skip-test-swift
+
+
 #===------------------------------------------------------------------------===#
 # Remote Mirror Library
 #===------------------------------------------------------------------------===#