[openstreetmap/openstreetmap-website] Support for Development Containers (devcontainers) (PR #6424)

[Andy Allan]

gravitystorm left a comment (openstreetmap/openstreetmap-website#6424)

I've tried this out today, using [`@devcontainers/cli`](https://www.npmjs.com/package/@devcontainers/cli) and it worked for me. I successfully ran the entire test suite, and I got `rails server` working after a couple of small tweaks.

<details><summary>devcontainers-cli specific notes</summary>
<p>
The port forwarding is not supported by @devcontainers/cli ( see https://github.com/devcontainers/cli/issues/186 and https://github.com/devcontainers/cli/issues/22) but this can be worked around. First, launch the server bound to all IP addresses, not just localhost within the container, i.e. `bundle exec rails server -b 0.0.0.0`. Secondly, add the port forwarding to the compose file, i.e.

```diff
--- a/.devcontainer/compose.yaml
+++ b/.devcontainer/compose.yaml
@@ -6,6 +6,9 @@ services:
       context: ..
       dockerfile: .devcontainer/Dockerfile
 
+    ports:
+      - "3000:3000"
+
     volumes:
     - ../..:/workspaces:cached
     - mise-cache:/home/vscode/.local/share/mise
```

It would be great if `cli` had the port forwarding built in, since it would then be an easy substitute for having our standalone docker config - it will suit many people who might want to use Docker but who aren't interested in the IDE side of things.

</p>
</details> 

My next plan is to test with [DevPod](https://devpod.sh/) to see how the IDE integration side of things works.

But from my side, this looks good to me. What are the current blockers, if any? Are there any other specific things you want tested? 

Since this PR is additive, should we merge this and iron out any kinks later?

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