create-app: add lint command

packages/create-app/.eslintrc.js

@@ -1,5 +1,6 @@
 module.exports = {
   extends: [require.resolve('@backstage/cli/config/eslint.backend')],
+  ignorePatterns: ['templates/**'],
   rules: {
     'no-console': 0,
   },

packages/create-app/package.json

@@ -21,7 +21,8 @@
     "backstage-create-app": "bin/backstage-create-app"
   },
   "scripts": {
-    "build": "backstage-cli build --outputs cjs"
+    "build": "backstage-cli build --outputs cjs",
+    "lint": "backstage-cli lint"
   },
   "dependencies": {
     "commander": "^4.1.1",