🐛 Fixed installation on windows TryGhost#10890 (TryGhost#12096)

closes TryGhost#10890

- use platform agnostic `exit 0` to allow `yarn setup` to work on windows
- requires powershell to be run as admin

package.json

@@ -26,7 +26,7 @@
     "test": "grunt validate",
     "ci": "grunt validate --verbose",
     "ci:regression": "grunt test-regression --verbose",
-    "setup": "yarn install && knex-migrator init && grunt symlink && grunt init || true",
+    "setup": "yarn install && knex-migrator init && grunt symlink && grunt init || (exit 0)",
     "lint:server": "eslint --ignore-path .eslintignore 'core/server/**/*.js' 'core/*.js' '*.js'",
     "lint:shared": "eslint --ignore-path .eslintignore 'core/shared/**/*.js'",
     "lint:frontend": "eslint --ignore-path .eslintignore 'core/frontend/**/*.js'",