[openstreetmap/openstreetmap-website] Wtf devcontainer (PR #6810)

[Pablo Brasero]

Following my tribulations at https://github.com/openstreetmap/openstreetmap-website/pull/6713, this helped me making the dev container work on both macOS/arm64 and Linux/amd64.

The main problem appeared to be with the way I set up a volume to cache the packages downloaded by Bundler. At the time this seemed like a good idea and worked. In fact I do think otherwise it would install the packages every time? Either I misinterpreted something or something has changed. Whatever. This works.

Another issue I ran into had to do with Postgres versions. The Docker image used by the dev container setup includes tools such as `pg_dump` which is used to generate `db/structure.sql`... but these tools expect Postgres v15. Since `compose.yaml` declares `postgres:16`, there's an incompatibility. How this worked for me on Linux and not on macOS is beyond my understanding, but it fixes things.

Additionally I have included a section in the docs explaining how to reset the DB when this happens.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/6810

-- Commit Summary --

  * Ensure version of Postgres compatible with client tools
  * No idea how, but this appears to be interfering under macOS/arm64
  * Explain how to regenerate a Postgres development volume

-- File Changes --

    M .devcontainer/compose.yaml (4)
    M doc/DEVCONTAINER.md (26)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/6810.patch
https://github.com/openstreetmap/openstreetmap-website/pull/6810.diff

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