Introduce aptible deploy (Direct Docker Deploy)

[krallin]

This command can be used in a few ways by customers:

First, it can be used to update an app to deploy from a Docker image (or update its current Docker image), as well as set environment variables.

aptible deploy --app foobar --docker-image httpd:alpine FOO=BAR

When this is done, the app's Dockerfile will be ignored going forward. However, other repo files might still influence the deploy.

Specifically, there are two possible cases:

• The app was deployed from git at some point in the past. In this case, the Docker image deploy will inherit the app's Procfile and .aptible.yml, if any. Enclave will fallback to the image's CMD as a Procfile substitute if none exists.
• The app was never deployed from git. In this case there is no Procfile or .aptible.yml, and Enclave uses the image's CMD. This is the recommended approach for users deploying from a Docker image.

It's also possible to completely remove the link to the git repo. When that's done, the files found in the git repo will be ignored going forward.

aptible deploy --app foobar --git-detach

But that's not all! It's also possible to go back to having a git repo without a git push.

This is useful since a git push may not trigger a deploy if there are no changes)

aptible deploy --app foobar --git-commitish master

Finally, it's possible to remove the app's Docker image to go back to a Dockerfile build, albeit with a non-ideal syntax for now:

aptible deploy --app foobar APTIBLE_DOCKER_IMAGE=

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cc @fancyremarker @UserNotFound

[codecov-io]

Codecov Report

Merging #230 into master will increase coverage by 0.74%. The diff coverage is 99.28%.

@@            Coverage Diff             @@
##           master     #230      +/-   ##
==========================================
+ Coverage   92.84%   93.58%   +0.74%     
==========================================
  Files          46       48       +2     
  Lines        1719     1856     +137     
==========================================
+ Hits         1596     1737     +141     
+ Misses        123      119       -4

Impacted Files	Coverage Δ
lib/aptible/cli/subcommands/deploy.rb	100% <100%> (ø)
spec/aptible/cli/subcommands/apps_spec.rb	100% <100%> (ø)	:arrow_up:
lib/aptible/cli/agent.rb	97.14% <100%> (+0.05%)	:arrow_up:
lib/aptible/cli/helpers/app.rb	100% <100%> (ø)	:arrow_up:
spec/aptible/cli/subcommands/deploy_spec.rb	100% <100%> (ø)
lib/aptible/cli/subcommands/config.rb	69.56% <75%> (+10.47%)	:arrow_up:

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[UserNotFound]

I think this excellent, and will add a lot of flexibility without needlessly increasing complexity.

[fancyremarker]

This was really intuitive. One minor comment:

Finally, it's possible to remove the app's Docker image to go back to a Dockerfile build, albeit with a non-ideal syntax for now:

aptible deploy --app foobar APTIBLE_DOCKER_IMAGE=

I initially expected to run aptible deploy --app foobar --docker-image "" to achieve this, but that may just be me. Take with a grain of salt.

[krallin]

@fancyremarker

This was really intuitive. One minor comment:

Finally, it's possible to remove the app's Docker image to go back to a Dockerfile build, albeit with a non-ideal syntax for now: aptible deploy --app foobar APTIBLE_DOCKER_IMAGE= I initially expected to run aptible deploy --app foobar --docker-image "" to achieve this, but that may just be me. Take with a grain of salt.

That actually works too, but I'm inclined to call it a non-ideal syntax too... :)

[krallin]

Planning to release this tomorrow morning UTC (once the server-side bits are live, which they aren't just now).