Dockerize app as well

[dahal]

We currently have docker configured to run database, inbucket (smtp) and minio (file uploads), but the app is not. Let's dockerize the whole thing, in this case we need to create docker configuration for our main app running on next.js / create t3 app.

Note: this app is build using next/create-t3-app, so this might come handy during the setup

• https://create.t3.gg/en/deployment/docker