[Tile-serving] [openstreetmap/mod_tile] Move redundant steps to local actions & use a Linux distribution matrix (#258)

[David Hummel]

You can see it in action:
On the `master` branch in my fork:
https://github.com/hummeltech/mod_tile/actions/runs/1168130722
On a `pull_request` here:
https://github.com/openstreetmap/mod_tile/actions/runs/1168130871

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