Branch name limit to 20 characters

[britt-mo]

Description

Serverless automates naming of resources based on the branch name, and long names can often overrun the automatically generated limit. We've shortened this limit before, but we're still seeing errors pop up. Shorten the length limit to 20 for all repos.

Related ticket(s)

CMDCT-3700

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How to test

checkout this branch, create a new branch that is longer than 20 characters, and make a change on your branch (e.g. change the text on a button)
run pre-commit run and you should see the error message Bad branch name detected in your terminal. A branch name under 20 characters that starts with a letter should pass this pre-commit check.

Notes

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Pre-review checklist

• I have added thorough tests, if necessary
• I have updated relevant documentation, if necessary
• I have performed a self-review of my code
• I have manually tested this PR in the deployed cloud environment

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Pre-merge checklist

Review

• Design: This work has been reviewed and approved by design, if necessary
• Product: This work has been reviewed and approved by product owner, if necessary

Security

If either of the following are true, notify the team's ISSO (Information System Security Officer).

• These changes are significant enough to require an update to the SIA.
• These changes are significant enough to require a penetration test.

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convert to a different template: test → val | val → prod

[codeclimate]

Code Climate has analyzed commit 897af0b and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (90% is the threshold).

This pull request will bring the total coverage in the repository to 81.1% (0.0% change).

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