[Tile-serving] [openstreetmap/mod_tile] Update GitHub Actions configuration (#245)

[hummeltech]

Hallo @xamanu, I noticed you changed to using GitHub Actions, awesome! So, I migrated the test I had added in my last pull request over to GitHub Actions!

https://github.com/openstreetmap/mod_tile/pull/220/files#diff-6ac3f79fc25d95cd1e3d51da53a4b21b939437392578a35ae8cd6d5366ca5485R36-R42

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