chore(admin-ui-plugin): Fix yarn path in build script

packages/admin-ui-plugin/build.ts

@@ -8,8 +8,9 @@ console.log('Building admin-ui from source...');
 
 fs.remove(compiledUiDir);
 
-const buildProcess = spawn('yarn', ['run', 'build:app'], {
-    cwd: path.join(__dirname, '../admin-ui'),
+const adminUiDir = path.join(__dirname, '../admin-ui');
+const buildProcess = spawn('yarn', [`--cwd ${adminUiDir}`, 'run', 'build:app'], {
+    cwd: adminUiDir,
     shell: true,
     stdio: 'inherit',
 });

packages/admin-ui/package.json

@@ -5,7 +5,7 @@
   "scripts": {
     "ng": "ng",
     "start": "node scripts/set-version.js && ng serve",
-    "build:app": "ng build --prod",
+    "build:app": "yarn ng build --prod",
     "build": "node scripts/copy-package-json.js && node scripts/set-version.js && node scripts/build-public-api.js && yarn ng build vendure-admin-lib --prod && node scripts/compile-styles.js",
     "watch": "ng build --watch=true",
     "test": "ng test --watch=false --browsers=ChromeHeadlessCI --progress=false",