Create really small docker image - with usage examples about grate HOT 5 CLOSED

I think this can be closed now, I don't think it's adding anything more than #82 and #41 do.

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Do we want to be responsible for maintaining a docker image (updating base dependencies, handling security updates etc) or is the example usage I'm doing for #41 enough to get started?

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FYI I had a crack at starting this as part of #41 . There's a few things that have made life more difficult than it should but there's something resembling a working sample coming when I PR that feature branch. Main gotchas so far include:

• adding the globalisation libraries into Alpine so SQL can work (I have to do this for RH/my apps as well so no biggie)
• the global.json has to be ignored due to a framework mismatch between the file and the alpine image.

Current image size is about 75Mb.

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FYI: Docker image is now available on Docker hub:

https://hub.docker.com/r/erikbra/grate

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It's possible to create a simple Dockerfile like this now:

FROM erikbra/grate:latest
COPY ./my_scripts ./db
ENTRYPOINT ./grate -f=db -o /var/output --connectionstring "$CONNECTIONSTRING"

and, then build and run it like this, provided you have your connection string in an environment variable, CONNECTIONSTRING, on the host.

docker build -t my-db-image .
docker run -it --rm -e CONNECTIONSTRING --mount type=bind,source="$(pwd)"/output,target=/var/output  my-db-image

Then the migration is run, and you get the output in the output folder in your current directory

There seems to be a bug (#89), however, <--- SOLVED in version 0.9.6

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