[NEW FEATURE] CI for Cent-OS

[martinkilbinger]

It could be helpful to add Cent-OS to the CI test cases.
candide is running with Cent-OS, so we could make this test candide-specifc (i.e. using package and library versions available on candide), to make sure the code will run on candide.

[sfarrens]

@martinkilbinger you just need to modify this line of the CI.