flutter-client VS dockerfiles

Hi, I'm one of the developers of Invoice Ninja. In the latest version of the selfhosted app we've added the ability to automatically set the tax based on the country. You can try it in the demo by enabling the "Calculate taxes" option on Settings > Tax Settings.

Invoice Ninja (version 5.0.102): Create invoices, accept payments, track expenses & time-tasks

You can try the demo here: https://demo.invoiceninja.com

Experiment with it via the demo to see if this will work for you. https://demo.invoiceninja.com/

Try out the demo by creating customers/invoice as order form. https://demo.invoiceninja.com

Invoice Ninja is a robust business suite for documenting invoices, tasks, expenses, maintaining inventory, automation, and many more features. This advanced invoicing software supports all desktop and mobile platforms unparalleled to the most prominent companies in the same business.

I use the Nginx Proxy Manager and manage everything through it. I have installed Invoice Ninja as described on Github (https://github.com/invoiceninja/dockerfiles) and it is running so far.

Invoice Ninja dockerfiles: https://github.com/invoiceninja/dockerfiles

Instructional links - https://github.com/invoiceninja/dockerfiles - https://www.youtube.com/watch?v=xo6a3KtLC2g - Here is a similar problem to mine, but I couldn't get it to work. https://github.com/invoiceninja/invoiceninja/issues/1699

Is there any reason you don't use the default docker-compose.yml here? https://github.com/invoiceninja/dockerfiles

Looks like straight forward and a standard Docker deployment, https://hub.docker.com/r/invoiceninja/invoiceninja/. Your questions are more general Docker understanding questions.