Allow the shm-size to be configured for an add-on

[knobunc]

Home Assistant release with the issue:

0.111.4

Operating environment (HassOS/Generic):

n/a

Supervisor logs:

n/a

Description of problem:

The Frigate add-on needs more than the default 64M of shared memory. There is an issue for it at mories76/ha-addon-frigate#4

The docker setting is at https://docs.docker.com/engine/reference/run/#runtime-constraints-on-resources

Ideally, it would be possible for the user to configure an shm size if the add-on requests that capability. For Frigate, the tuning would depend on the number of cameras and the resolution used.

At the very least we should allow the add-on to change the shm setting.

[pvizeli]

You can write up an RFC and if they is approved, implement the soution 👍