[Tile-serving] [openstreetmap/mod_tile] Added CI and documentation for CentOS (#251)

[ǝɹʇʇɐʃǝ◖ xıʃǝɟ]

Rerolling changes from @hummeltech to indroduce support for CentOS, as documentation and check in the CI.

@hummeltech, please confirm this is fine and attribution is alright.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/mod_tile/pull/251

-- Commit Summary --

  * Added CI and documentation for CentOS

-- File Changes --

    A .github/actions/yum/provision/centos-7/action.yml (28)
    A .github/workflows/build-and-test-centos-7.yml (91)
    A docs/building_on_centos_7.md (77)

-- Patch Links --

https://github.com/openstreetmap/mod_tile/pull/251.patch
https://github.com/openstreetmap/mod_tile/pull/251.diff

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