[openstreetmap/openstreetmap-website] Fix broken `libpgosm.so` (#3286)

[David Hummel]

Alright, I've moved everything into a new workflow (`Tests (libpgosm.so)`) & made it only run on:
```YAML
  push:
    branches:
      - master
```
https://github.com/hummeltech/openstreetmap-website/actions/runs/1103419155

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