GDAL export container

[icarito]

I've created a Dockefile to define an image of GDAL 2.4.1 + Imagemagick + Ruby 2.5.

**You can try this ** by getting the already-built image from Docker-hub!

run docker run icarito/gdal_ruby_imagemagick:buster

Make sure these boxes are checked before your pull request is ready to be reviewed and merged. Thanks!

• tests pass -- rake test
• code has been rebased on top of latest master (check if another pull request was added recently, and please rebase)
• pull request is descriptively named and, if possible, multiple commits squashed if they're smaller changes

Thanks!

[icarito]

This PR seems to have some artifacts of another branch, I'll clean it up, sorry!

[jywarren]

What do you think the best minimal interface is to connect export.rb to the outside world? I'd guess it's probably going to be more efficient than Rails to have a more minimal way to initiate commands to export.rb and provide HTTP progress responses as it runs (say, static JSON files with status).

[jywarren]

Also, I wonder if you could try setting up the container without the Rails app but with minitest, so we can run the tests from /test/unit/exporter_test.rb (from #341) on this stand-alone version of the exporter?

[jywarren]

Connecting back to https://github.com/googleapis/google-cloud-ruby from the resources issue in #296, which may be a good template for a cloud service in Ruby.

(update - oh that's just a client library... i was thinking of something else. But we should see what the best-practice way to host a cloud service on Ruby is!)

[jywarren]

Aha - added these to #296 but see:

• https://cloud.google.com/ruby/rails/
• https://cloud.google.com/appengine/docs/flexible/ruby/

[jywarren]

Yes! The Hello World app is a very basic one-file Sinatra application -- sinatra, i guess, then!

[jywarren]

https://github.com/GoogleCloudPlatform/ruby-docs-samples/tree/master/appengine/hello_world here it is!

[icarito]

Hi @jywarren I've made a Sinatra app that receives a posted warpable.json file and parses it, but I need some directions on how to trigger https://github.com/publiclab/mapknitter-exporter or even better if it could parse the json file itself ;-)

[jywarren]

Moving to publiclab/mapknitter-exporter-sinatra#1