[TBD] Fix bug in sub-domain generation

[tjwiebell]

Description

buildpack create-custom-origin . uses the current directory as the seed for a unique hash, but the existing logic could result in an invalid sub-domain value.

Related Issue

Closes #ISSUE_NUMBER.

Acceptance

Verification Stakeholders

Specification

Verification Steps

Test scenario(s) for direct fix/feature

1. Scaffold or clone into known bad path (/path/to/fake/cwd appears to work)
2. Run yarn buildpack create-custom-origin .
3. Verify that valid host and sub-domain are generated

Test scenario(s) for any existing impacted features/areas

Test scenario(s) for any Magento Backend Supported Configurations

Is Browser/Device testing needed?

Any ad-hoc/edge case scenarios that need to be considered?

Screenshots / Screen Captures (if appropriate)

Breaking Changes (if any)

Checklist

• I have added tests to cover my changes, if necessary.
• I have added translations for new strings, if necessary.
• I have updated the documentation accordingly, if necessary.

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