Optimize how much data needs to be `chown`/`chmod`ed on container startup (#7793)

* Optimize how much data needs to be `chown`/`chmod`ed on container startup

This works around an issue where `chmod`/`chown` operations inside a
container can be extremely slow when using the `overlay2` storage
driver, resulting in 10min+ container startup times.

It modifies the owner of the webapp when building the container so that
only the `data` and `extensions` directories (which are commonly mapped
as volumes into the container) have to be modified by the
`access-permissions.sh` script at container startup.

When not running via docker the behaviour of the `access-permissions.sh`
script is unchanged.

* Take DATA_PATH environment variable into account when fixing permissions

* Revert change to using bash for arrays

(the alpine image doesn't include `bash`)

* A few more improvements

* Slightly tweak reapply permissions variable

- lowercase to indicate it's not an env variable
- use 0/1 to address potentially-irrational paranoia about unset variables

* Remove conditional logic to skip reapplying permissions

Also documents why in a comment so it's not missed in the future.

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Co-authored-by: Alexandre Alapetite <alexandre@alapetite.fr>

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