Continuous deployment

[stvnrlly]

This uses cf-blue-green to do zero-downtime deploys. On the cloud.gov side, a zero-downtime deploy requires more than 1 instance to be running so that the app can be built in the background before switching over.

[codecov-io]

Current coverage is 90.55%

Merging #53 into master will not affect coverage as of 54bdc88

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  Files            9       9       
  Stmts          360     360       
  Branches        17      17       
  Methods          0       0       
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  Hit            326     326       
  Partial          3       3       
  Missed          31      31       

Review entire Coverage Diff as of 54bdc88

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[jmcarp]

FWIW, my impression is that full-fledged cf plugins are preferred over cf-blue-green, which is a bash script without unit tests. I've been using https://github.com/concourse/autopilot with good success, and https://github.com/bluemixgaragelondon/cf-blue-green-deploy looks good too.

[stvnrlly]

Thanks for the info, @jmcarp. I'm starting with cf-blue-green because it includes Travis documentation, but plan to investigate autopilot as a next step.

[jmcarp]

Rad. There's a working example of deployment from travis with autopilot at https://github.com/18F/atf-eregs/blob/master/.travis.yml#L19-L30.