* Add support for reading `renderd.conf` to `render_expired`
* Add support for reading `renderd.conf` to `render_list`
* Add support for reading `renderd.conf` to `render_old`
* Add support for reading `renderd.conf` to `render_speedtest`
* Move renderd/render_* execution tests to own files
* Reduce variable scope & minor clean up
* Use `stat` rather than `access` to check if file exists
* Improve service startup "tests"
* Address intermittent download test failure
* Caused by load exceeding threshold
* Add more missing bad HTTPD config tests
* Allow for newer `libpng` with Docker tests
* Also test more image/file types
* Report coverage for almost all jobs
* Some jobs fail and are omitted
* Add more tests to `gen_tile_test.cpp`
* Also lightly cleaned up formatting
* Clean up cmake/* files
* So they don't report an empty version
* Remove commented `check_*` lines from `CMakeLists.txt` file
* These were left over from the initial CMake support implementation
By taking advantage of `YAML anchors`: https://docs.docker.com/compose/compose-file/10-fragments/
_Also_:
- Added `full` service to `docker/docker-compose.yml` (including real osm data and openstreetmap carto)
- Under `ubuntu-devel-full`
- I.E. (`cd docker && docker compose up ubuntu-devel-full`)
- In order to more fully test
