Use secret key base from env
We should be using a value from the environment instead of a hardcoded value that's going to be readable once the project is open-sourced. This is a potential attack vector.
The env value might need to be changed to avoid problems.
Related to https://git.fpfis.eu/future-of-europe/dife-decidim-fluxcd/-/merge_requests/6
Edited by Ghost User