Fix docker build

[Flynsarmy]

When attempting to run in docker i was getting:

1.772 [vite:load-fallback] Could not load /usr/src/app/build/ez-tree.es.js (imported by src/app/scene.js): ENOENT: no such file or directory, open '/usr/src/app/build/ez-tree.es.js'
1.772 Error: Could not load /usr/src/app/build/ez-tree.es.js (imported by src/app/scene.js): ENOENT: no such file or directory, open '/usr/src/app/build/ez-tree.es.js'

This was caused by the Dockerfile not building the lib before the app on a clean install.