Possibility to inject more than one vault secret into a service

we would like to have the possibility to inject more than one secret vault (by the vault window) into a service.

the interface may be like the extraEnvVar.

the onyxia init script should also be modifed
i dont know if the issue is at the right place.

Start by tracing how the Helm charts currently expose a single vault secret and compare that interface with extraEnvVar. Then inspect the Onyxia init script mentioned in the issue to identify all affected entry points. Done means a service can receive more than one vault secret through the vault window and the init script handles the new configuration.

Written by the indexing model from the issue text.