[openstreetmap/openstreetmap-website] Add Docker Compose Support for Development Environment (#2409)

[Tobias]

@migurski I am having trouble uploading a GPX trace. Could that be a docker issue (in the sense, that docker does not have a file system to write to or something like this?) – or do I need to look somewhere else?

**Testcase:**
- http://localhost:3000/traces/new
- Use file https://www.openstreetmap.org/trace/3460088/data (from https://www.openstreetmap.org/user/tordans/traces/3460088)
=> Upload

**Details about the error:**
<details>

```
NoMethodError in TracesController#create
undefined method `id' for nil:NilClass

108 109 110 111 112 113 | end        if @trace.id         flash[:notice] = t ".trace_uploaded"         flash[:warning] = t ".traces_waiting", :count => current_user.traces.where(:inserted => false).count if current_user.traces.where(:inserted => false).count > 4
-- | --

Rails.root: /app

Application Trace | Framework Trace | Full Trace
app/controllers/traces_controller.rb:110:in `create'
app/controllers/application_controller.rb:333:in `better_errors_allow_inline'
config/initializers/compressed_requests.rb:27:in `call'
config/initializers/cors.rb:9:in `call'

Request
Parameters:

{"utf8"=>"✓",
 "authenticity_token"=>"ObG7QWOGKxtg0N3mbIILp7lQXHaOlZba3XKgscyyEAguc5wlb5ImS6xqtnw1qPZvaYIFnCpRafNF8CcjDgu9+g==",
 "trace"=>
  {"gpx_file"=>
    #<ActionDispatch::Http::UploadedFile:0x00007f69da1ac840
     @content_type="application/octet-stream",
     @headers="Content-Disposition: form-data; name=\"trace[gpx_file]\"; filename=\"3460088 (1).gpx\"\r\n" + "Content-Type: application/octet-stream\r\n",
     @original_filename="3460088 (1).gpx",
     @tempfile=#<File:/tmp/RackMultipart20210102-1-imhec7.gpx>>,
   "description"=>"Test 123123123123",
   "tagstring"=>"",
   "visibility"=>"public"},
 "commit"=>"Hochladen"}
```

</details>

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