[openstreetmap/openstreetmap-website] Errors on Docker + Apple Silicon (Issue #6287)

[Pablo Brasero]

pablobm created an issue (openstreetmap/openstreetmap-website#6287)

At the moment, the test suite fails when running in a Docker container on Apple Silicon.

I cloned the repo for the first time today and setup it up using the Docker instructions. I am using a MacBook Pro on Apple silicon. In my environment, the test suite is showing a few of these:
```
Error:
TraceTest#test_import_handles_gz:
NoMethodError: undefined method `gdImageCreate' for GD2::GD2FFI:Module
    lib/gpx.rb:81:in `block in picture'
    lib/gpx.rb:80:in `picture'
    app/models/trace.rb:258:in `block in import'
    app/models/trace.rb:205:in `import'
    test/models/trace_test.rb:255:in `test_import_handles_gz'
```

After looking a bit into it, it appears that the `gd2-ffij` gem doesn't handle the possibility of `libgd` living under `/usr/lib/aarch64-linux-gnu`. This is the offending code: [/lib/gd2-ffij.rb](https://github.com/dark-panda/gd2-ffij/blob/039480b72246463d9ad8acc6aed0536a1a31ec50/lib/gd2-ffij.rb#L35)

I'm not sure there is a non-horrible way to solve this. There's a recent PR in the `gd2-ffij` repo that would help (https://github.com/dark-panda/gd2-ffij/pull/28) but the repo hasn't had new commits since 2021, so I'm not hopeful that it will be merged any time soon.

For the moment, anyone with a setup similar to mine may have to resort to hacks. For example, I can get things going by adding the following environment variable in `docker-compose.yml`. However this not portable at all so I can't just create a PR:
```diff
diff --git a/docker-compose.yml b/docker-compose.yml
index e98824e50..d8293a0f9 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -4,6 +4,7 @@ services:
       context: .
     environment:
       PIDFILE: /tmp/pids/server.pid
+      GD2_LIBRARY_PATH: /usr/lib/aarch64-linux-gnu
     volumes:
       - .:/app
       # Prevent these directories from mounting so they're not shared between host OS and Docker
```
Thoughts? At least I guess this issue may help as a guide to others who find the same issue.

By the way, the "horrible ideas" that cross my mind are:
1. Fork `gd2-ffij`.
2. Monkey-patch `GD2::GD2FFI.gd_library_name`.

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