manually install target toolchain

Author: dimitropoulos

packages/turbo-repository/scripts/build.sh

@@ -13,7 +13,7 @@ script_provided_flags="\
 for flag in $user_provided_flags; do
   if [[ $flag == --target=* ]]; then
     target=${flag#*=}
-    rustup target add "$target"
+    rustup toolchain install stable --target "$target"
 
     # For we need to cross-compile some targets with Zig
     # Fortunately, napi comes with a `--zig` flag
@@ -23,7 +23,7 @@ for flag in $user_provided_flags; do
   fi
 done
 
-node_modules/.bin/napi build $script_provided_flags $user_provided_flags
+node_modules/.bin/napi build "$script_provided_flags" "$user_provided_flags"
 
 # Unfortunately, when napi generates a .d.ts file, it doesn't match our formatting rules (it doesn't have semicolons).
 # Since there's now way to configure this from napi itself, so we need to run prettier on it after generating it.