docs(compose): prevent anonymous volume creation

[larsgerber]

Addition to #176.

The Redis image (https://github.com/redis/docker-library-redis/blob/f00ff0562e52e24f0cde26988628ad7de51fd8d8/7.2/Dockerfile#L113) uses the VOLUME instruction, which creates an anonymous volume when the container is started.

Since we cannot change the base image, our only option is to mount the path via tmpfs. This way no volume is created. (confirmed with docker volume ls)

[cupcakearmy]

Super interesting, thanks for digging into it!
Tecnically however this should not matter, as it's not being used anyways at this point.

[larsgerber]

Technically, both the tmpfs mount and the Redis parameters achieve the same goal: no persistence. This change is mainly to prevent confusion, as I initially questioned why a volume was created when the project is supposed to be non-persistent.

I just wanted to share my findings. Feel free to close the PR if it's not needed.

Thank you for your efforts! I really like this project, especially when used with your Raycast extension.