Make `sh` `exec` into explicit to avoid valkey getting SIGKILLed

[ypid-work]

Desired Behavior

netbox-docker/docker-compose.yml

Lines 52 to 54 in 9b2793a

	- sh
	- -c # this is to evaluate the $REDIS_PASSWORD from the env
	- valkey-server --appendonly yes --requirepass $$REDIS_PASSWORD ## $$ because of docker-compose

should be changed to exec valkey-server (all occurrences).

Contrast to Current Behavior

It is currently implicit (da)sh behavior that could stop working if someone not aware changes the inline shell script.

Required Changes

No response

Discussion: Benefits and Drawbacks

I have posted more details here: valkey-io/valkey-container#71 (comment)

[tobiasge]

Feel free to open a PR.

[ypid-work]

I cannot easily do that for company policy reasons. Otherwise I would have done that.