Build local architecture CLI arg

Summary:
The current '--mac' arg builds all supported architectures. This is great when generating release builds but not so much when testing a release for the current architecture.

Not modifying the existing '--mac' arg as to not update our current CI.

Reviewed By: antonk52

Differential Revision: D50497211

fbshipit-source-id: 3e4d9728adc822c48788556e2ea47f4dd1c21b05

desktop/scripts/build-flipper-server-release.tsx

@@ -132,7 +132,12 @@ const argv = yargs
       default: false,
     },
     mac: {
-      describe: 'Build a platform-specific bundle for MacOS.',
+      describe: 'Build arm64 and x64 bundles for MacOS.',
+      type: 'boolean',
+      default: false,
+    },
+    'mac-local': {
+      describe: 'Build local architecture bundle for MacOS.',
       type: 'boolean',
       default: false,
     },
@@ -455,6 +460,15 @@ async function buildServerRelease() {
     platforms.push(BuildPlatform.MAC_X64);
     platforms.push(BuildPlatform.MAC_AARCH64);
   }
+  if (argv.macLocal) {
+    const architecture = os.arch();
+    console.log(`⚙️  Local architecture: ${architecture}`);
+    if (architecture == 'arm64') {
+      platforms.push(BuildPlatform.MAC_AARCH64);
+    } else {
+      platforms.push(BuildPlatform.MAC_X64);
+    }
+  }
   if (argv.win) {
     platforms.push(BuildPlatform.WINDOWS);
   }