CI: verify installation of dependencies
CI: verify installation of dependencies

That we see a problem like https://github.com/ecamp/ecamp3/pull/1092 earlier.

pmattmann/ecamp3,usu/ecamp3,usu/ecamp3,usu/ecamp3,pmattmann/ecamp3,pmattmann/ecamp3,ecamp/ecamp3,usu/ecamp3,ecamp/ecamp3,pmattmann/ecamp3,ecamp/ecamp3,ecamp/ecamp3