Fix Podman usage for seeder tests

See merge request !8

add entrypoint for time wait and expand secret

See merge request !7

mapcache_seed always crashes due to an invalid free(), but now we
continue seeding other tilesets anyway

Fixes #7

rename config file to enable vs-starter unique key

See merge request !6

(name must be unique)

Currently we get errors like these:
failed (2) to parse time 2019-10-26T09:20:51.024/2019-10-26T09:20:51.024