Pass --sccache

Author: jcmosc

.github/actions/build-swift-project-macos/action.yml

@@ -30,7 +30,8 @@ runs:
         utils/build-script --skip-build-benchmarks \
           --swift-darwin-supported-archs "$(uname -m)" \
           --release --swift-disable-dead-stripping \
-          --bootstrapping=bootstrapping-with-hostlibs
+          --bootstrapping=bootstrapping-with-hostlibs \
+          --sccache
       shell: bash
       working-directory: ./swift-project/swift
       env: