build-script: T3664: Add flavor and architecture to image name (rework)

[zdc]

Change Summary

Add flavor and architecture to image name (rework)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Migration from an old Vyatta component to vyos-1x, please link to related PR inside obsoleted component
• Other (please describe):

Related Task(s)

• https://vyos.dev/T3664

Component(s) name

build-script

Proposed changes

The previous version did not work for all flavor types. This one should be universal.

How to test

Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly

[c-po]

@Mergifyio backport sagitta

[mergify]

backport sagitta

✅ Backports have been created

• #621 build-script: T3664: Add flavor and architecture to image name (rework) (backport #620) has been created for branch sagitta