Make melos prepare command a single line (#153)

* Make melos prepare command a single line

* Fix description of melos prepare

* Run tests on various os

* Remove macos due to default sqlite limitation

* Remove windows os

* Revert workflow changes

Author: mugikhan

melos.yaml

@@ -22,10 +22,9 @@ command:
 
 scripts:
   prepare:
-    description: Download SQLite3 WASM for demos
+    description: Download and prepare assets for demos
     run: |
-      melos bootstrap && melos prepare:assets && dart ./scripts/compile_webworker.dart && dart ./scripts/init_powersync_core_binary.dart
-      dart ./scripts/download_core_binary_demos.dart && melos prepare:demos
+      melos bootstrap && melos prepare:assets && dart ./scripts/compile_webworker.dart && dart ./scripts/init_powersync_core_binary.dart && dart ./scripts/download_core_binary_demos.dart && melos prepare:demos
 
   prepare:demos:
     description: Download SQLite3 wasm for demos