automate building of docker images when dockerfiles are updated

[rabernat]

One way to begin to automate the deployment of our GCE would be to automatically build the docker images whenever the dockerfiles are updated in this repo. It looks like that is not too hard to do:
https://docs.docker.com/docker-hub/builds/

That would remove some of the manual steps in the cluster update process.

xref #128, #117

[mrocklin]

We might also want to run helm upgrade if we're able to securely store secrets in a CI server somewhere.

We might also want to move this to a different repository that is specific to the pydata.pangeo.org deployment and keep this repository suitably general.

[rabernat]

Can you clarify what you mean by "run helm upgrade"? Run where? Is it possible to automate that as well somehow?

My understanding is that helm upgrade had to be run manually / locally. I don't know enough CI to know how to automate that step.

[mrocklin]

The CI Server could run that command, much as it currently runs py.test ...

The helm upgrade step is defined here https://github.com/pangeo-data/pangeo/blob/master/gce/update.md#upgrade

[rabernat]

Ah ok you mean travis. Gotcha.

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