[openstreetmap/openstreetmap-website] Export feature sometimes produces large PDF files (Issue #4687)

[kumakyoo]

### URL

_No response_

### How to reproduce the issue?

_No response_

### Screenshot(s) or anything else?

When using "Share" on the right side of the OSM website, it's possible to export the visible area as PDF file. The generated PDF files are sometimes much larger than necessary, likely, because they sometimes include gigantic relations (e.g. bus routes). See [discussion in the german OSM forum](https://community.openstreetmap.org/t/pdf-dateigrosse-von-openstreetmap-org-stark-gewachsen/111516/7) for an example - the tiny red dot in the image there is the export region.

I tried to hunt this bug down and reached an end when the submittion is redirected to `https://render.openstreetmap.org/cgi-bin/export` in `export_controller.rb`. I couldn't figure out, where the source code of this cgi is. I guess not even in this repo, but maybe I just overlooked something.

I would appreciate if someone could point me to the source code, so I can continue the "hunting". :-)

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