Set SecurityContext('s) based on PUID and PGID

[Ornias1993]

Is your feature request related to a problem? Please describe.
PUID and PGID work fine for s6_overlay based containers, but not all containers are.
For other we might want to just use SecurityContext instead.

Describe the solution you'd like

• Set the security contexts based on PUID and PGID.
• Don't set them when using S6_overlay based containers, set them if we do.
• Test if we can set fsgroup when running S6_overlay based containers

Describe alternatives you've considered
Leaving it as is or having seperate settings.
The first is sub-optimal, the second is going to get messy and inclear for "the average user"

[Ornias1993]

Considering this is not a minor patch, it's best suited for next release of TrueNAS SCALE, along with the other refactors.

[Ornias1993]

Done in the staging branch!

[truecharts-admin]

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