.env and http init trigger for reload

[ch-sander]

• creates a .env and docker-compose.yml for better maintenance

• proposes an untested solution for https://github.com/epoz/shmarql/issues/9 https://github.com/epoz/shmarql/issues/10 https://github.com/epoz/shmarql/issues/11

  • instead of updating the Store on the fly the loading of the Store can now be called via endpoint /init/graph. Similar for fts and RDF2Vec
  • the /init route is behind HTTPBasicCredentials, User and PW defined in .env (resp. config.py)

    Issue

• [ ] unsure how the global variables loaded/initialized in main.py can be updated in the best way if changed at runtime. Maybe a better way would be Dependency Injection in FastAPI with Depends for all depending endpoints

[ch-sander]

The main stuff has been tested briefly

• /init/graph route works with HTTPBasicCredentials defined in .env
• query params in https://github.com/epoz/shmarql/pull/17/commits/3e3ddf7910f0b809a3b3ecb48a12aaba522d32c1 have not fully been tested, only use_default_graph_as_union for https://github.com/epoz/shmarql/issues/13#issuecomment-2307225004