Installing custom PHP extensions

[BjornDCode]

Currently it's possible to install PHP extensions yourself but it's too complicated to do manually.

The current steps require you to do the following:

1. Create a docker folder in the project root
2. Create a Dockerfile inside the docker folder with the following contents:

FROM bjornlindholm/laravel:7.4

RUN apt-get update
RUN apt-get install -y php7.4-gmp

CMD ["supervisord"]

Where php7.4-gmp is the name of the extensions to install.
3. Update docker-compose.yml
Replace

services:
  app:
      image: bjornlindholm/laravel:7.4

With:

services:
  app:
    build:
      context: ./docker

Instead I would like to specify extensions in the serve.toml file and create a UI for it as well