TIMX 345 - Add CLI command init-job

[ghukill]

Purpose and background context

This PR introduces the first real CLI command init-job that is used to initialize a new job:

• require job-directory argument to know where to create new job
• require "A" and "B" git commit SHAs of Transmogrifier to build images
• run core.init_job function to create new job
• run core.build_ab_images to create new images based on A/B commit SHAs

How can a reviewer manually see the effects of these changes?

pipenv run abdiff --verbose init-job \
-d output/hello-world \
-m "Hello World" \
-a 395e612f8887b279ccf35363694bafb06ef9a25a \
-b 1910426fbcc98e098de222ccdcce3cf3ac1337e7

This should:

• create a new directory at output/hello-world
• build two images of Transmog for the SHAs provided
  • can confirm from terminal with docker images | grep "transmogrifier-hello-world"
• log the contents of job.json

Re-running the command without any modification should return:

Error: Job directory already exists: 'output/hello-world', cannot create new job.

Includes new or updated dependencies?

NO

Changes expectations for external applications?

NO

What are the relevant tickets?

• https://mitlibraries.atlassian.net/browse/TIMX-345

Developer

• All new ENV is documented in README
• All new ENV has been added to staging and production environments
• All related Jira tickets are linked in commit message(s)
• Stakeholder approval has been confirmed (or is not needed)

Code Reviewer(s)

• The commit message is clear and follows our guidelines (not just this PR message)
• There are appropriate tests covering any new functionality
• The provided documentation is sufficient for understanding any new functionality introduced
• Any manual tests have been performed or provided examples verified
• New dependencies are appropriate or there were no changes

[ehanson8]

Great work, just 2 suggestions

[coveralls]

Pull Request Test Coverage Report for Build 10793417875

Details

• 35 of 35 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+1.2%) to 97.647%

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Totals
Change from base Build 10740174227:	1.2%
Covered Lines:	166
Relevant Lines:	170

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💛 - Coveralls

[ehanson8]

Approval stands