This patch adds `automountServiceAccountToken: false` to various
ServiceAccount objects in order to disable automatic mounting of service
accounts tokens to Pods that never need to use them.

nginx counts parallel requests in HTTP/2 and HTTP/3 as connections.

This patch updates the limits after checking nginx logs to see that the
previously configured limits are exceeded by 100 times.

This patch hopefully fixes issues with sending kill signals to subprocesses from the master process of dovecot.

Exmaple error logs:
```
Jan 25 00:27:16 master: Error: service(auth): kill(14, SIGINT) failed: Operation not permitted
Jan 25 00:28:16 master: Error: service(auth): Process 14 is ignoring idle SIGINT
```

This patch moves the dovecot config from the container build to the helm
chart which allows to use templating with values that are configured at
runtime. This should provide more flexibility and standardizes the
dovecot container further.

This patch updates the link to the helm repository for AMD GPU drivers
after AMD changed Github organisation names.