Add Docker update documentation

[fatbasstard]

This PR adds some minor documentation about updating TeslaMate when installed with Docker.

This to help out with updating it when people are not too familiar with Docker.

[adriankumpf]

Thank you 👍

[cwanja]

Consider compressing it into a single command?
docker-compose down && docker system prune && docker-compose pull && docker-compose up -d
Not sure the prune is necessary, but I include it.

[DrJohnM61]

Consider compressing it into a single command?

`

docker-compose down && docker system prune && docker-compose pull && docker-compose up -d

`

Not sure the prune is necessary, but I include it.

The prune should logically go after the pull as it will clean up and redundant images created by pulling new (updated) images

[cwanja]

Excellent, thanks for that feedback. Will update my own script.

…

Sent from my iPhone Chris Wanja chris.wanja@mac.com 713.444.6999

On Jan 10, 2021, at 12:45 PM, John Maton ***@***.***> wrote:  Consider compressing it into a single command? ` docker-compose down && docker system prune && docker-compose pull && docker-compose up -d ` Not sure the prune is necessary, but I include it. The prune should logically go after the pull as it will clean up and redundant images created by pulling new (updated) images — You are receiving this because you commented. Reply to this email directly, view it on GitHub, or unsubscribe.

[RobertPaulson90]

Isn't the prune risky to run inbetween docker-compose down and docker-compose up -d? Won't it delete your data?

Use this instead: docker-compose down && docker-compose pull && docker-compose up -d && docker system prune

[cwanja]

Isn't the prune risky to run inbetween docker-compose down and docker-compose up -d? Won't it delete your data?

Use this instead: docker-compose down && docker-compose pull && docker-compose up -d && docker system prune

Never had a data loss issue with the docker system prune erasing data. But I am open to more suggestions and advice. Am not a Docker expect by any stretch.

[roadrash2108]

It's already merged, but I wonder why the information is duplicated as it is in https://github.com/adriankumpf/teslamate/blob/master/website/docs/installation/docker.md and https://github.com/adriankumpf/teslamate/blob/master/website/docs/upgrading.mdx !?

IMHO this should be referenced in the installation-documentation, but not duplicated...