[Chandler] Add an FPM docker image

[slifty]

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Is your feature request related to a problem? Please describe.
Monica provided an FPM docker image, which allowed me to set up my own reverse proxy. This is useful for https but also in my case I'm using Synology DSM which runs on a very old host kernel / can't run apache-based docker containers.

Describe the solution you'd like
Could the chandler build also be set up to publish an FPM version of the image, the way Monica does?

Describe alternatives you've considered (optional)
I believe the alternative would be for end users to build their own docker images.

Additional context
None.

[djaiss]

@asbiin what do you think of this? I know nothing of Docker and image building.

[slifty]

Actually I think in the most recent docker release has a 5.0 FPM image: https://hub.docker.com/layers/library/monica/5.0.0-beta-fpm-alpine/images/sha256-b6bf043c29c739b39cc9a485074f52df1b568c9fae9cb4703b7a66c69ea389ce?context=explore

So I can mark this as closed (also since opening this issue I learned that there is the docker repo and I should have opened it there).