chore(docker): set api.environment.DB_URL

[sripwoud]

Description

Docker is the most convenient way to get started. As the docker compose files already define a postgres service with migrations applied.
However the environment variables are set with an env_file and the .env.example uses sqlite. Which is confusing.
As a dev:

• I don;t want to have to deal with DB setup and seeding: that's good you provide a postgres service in docker compose
• I may run the api with the docker service OR with yarn dev (because i am making changes and don;t want to rebuild the image every time)

Depending on the situation the postgres url will be different (different host: postgres or localhost).
To accomodate for both situations, one needs either to use different .env files (e.g .env.local and .env.docker).
Or one can override the env_file by setting environment.DB_URL in docker compose.
This PR does the latter.

Does this introduce a breaking change?

• Yes
• No

Checklist

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have run yarn prettier and yarn lint without getting any errors
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Important

We do not accept minor grammatical fixes (e.g., correcting typos, rewording sentences) unless they significantly improve clarity in technical documentation. These contributions, while appreciated, are not a priority for merging. If there is a grammatical error feel free to message the team.

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