add ecr-promote cli tool

[segersniels]

Review the Contributing Guidelines

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Describe Why This Is Awesome

Why is this awesome?
Working with a lot of microservices can make it chaotic to promote a lot of image versions between environments.

ecr-promote tries to solve this by letting the user select a CircleCI build through an interactive prompt to promote between these accounts. It currently only supports CircleCI as a CI base, but I'm open to suggestions to add other CI tools.

eg. CircleCI builds staging images and ecr-promote allows the user to easily promote them to a production account (by fuzzy matching git repos to ECR repos).

Example

Configure

# Add environments to your config
$ promote add env staging
? AWS_ACCESS_KEY_ID? dummy
? AWS_SECRET_ACCESS_KEY? dummy
? AWS_DEFAULT_REGION? eu-west-1

$ promote add env production
? AWS_ACCESS_KEY_ID? dummy
? AWS_SECRET_ACCESS_KEY? dummy
? AWS_DEFAULT_REGION? eu-west-1

# Set the default environments for promote to use
# These can also be set by passing the --from and --to flags to the plan command
$ promote default source staging
$ promote default destination production

# Add the github repository
$ promote add repo foo/bar

Promote

# Start a promote filtering through all the added repos on word 'bar'
$ promote plan --filter bar
? Which repo would you like to promote? foo/bar # User selects the correct repository
? Which build? 23 | fixed issue (success) # User selects the desired commit/build that needs to be promoted from staging to production
? Source repository? bar-staging # Fuzzy matched ECR repository to Github repository
? Destination repository? bar-production
ERRO[0005] Tag 0.0.1-23 already exists at destination

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[codecov-io]

Codecov Report

Merging #145 into master will not change coverage.
The diff coverage is n/a.

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  Misses          3        3

[miketheman]

The linked GitHub repo is gone.