chore: Do not lint external apps

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

package.json

@@ -12,8 +12,8 @@
     "postbuild": "npm run sass && npm run sass:icons",
     "dev": "webpack --node-env development --progress",
     "watch": "webpack --node-env development --progress --watch",
-    "lint": "eslint apps core",
-    "lint:fix": "eslint apps core --fix",
+    "lint": "eslint $(for appdir in $(ls apps); do if ! $(git check-ignore -q $appdir); then echo -n \"$appdir \"; fi; done) core --no-error-on-unmatched-pattern",
+    "lint:fix": "eslint $(for appdir in $(ls apps); do if ! $(git check-ignore -q $appdir); then echo -n \"$appdir \"; fi; done) core --no-error-on-unmatched-pattern --fix",
     "test": "jest",
     "test:watch": "jest --watch",
     "test:coverage": "jest --coverage",