Feature: Docker image about tern HOT 2 OPEN

I can see how that could be useful. Unfortunately, I have only minimal experience with Docker and that was several years ago. I'm very reluctant to merge a feature that I am unable to easily understand and maintain.

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hi, we needed this since we want to use tern to apply migrations in our k8s init containers.

we did it here https://gitlab.com/gfx-devops/tern
you can pull it here registry.gitlab.com/gfx-devops/tern:v2.1.1

you can use it with docker run as well, ala docker run -v .:/root registry.gitlab.com/gfx-devops/tern:v2.1.1 print-connstring

it is a simple image that pulls the release from the github release.

i'll be manually creating new tags for now, probably will set up something automated in the future.

@muhlemmer let me know if you would like me to create base images on something that isn't x86 alpine (it is trival). otherwise you can just use the image as a layer and copy /usr/local/bin/tern

from tern.