remote: T7048: merge git environment with the os environment

[xeluior]

Change summary

When using a git-backed commit archives, the environment of the parent process will now be merged with the environment of the git processes spawned by the commit-archive opertations. The primary motivation is to enable usage of ssh-agent for password-protected ssh-keys, but this also enables the user customization of the git operations via Git Environment Variables.

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/T7048

Related PR(s)

How to test / Smoketest result

ssh-keygen # enter a password, do not use generate ssh client-key since it will not make password-protected keys
eval $(ssh-agent)
ssh-add # enter your password
# add the public key to github
conf
set system config-management commit-archive location git://[email protected]:<username>/<repo>.git
commit
# you will no longer be prompted for your password

Checklist:

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

[github-actions]

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No issues in PR Title / Commit Title

[github-actions]

CI integration 👍 passed!

Details

CI logs

• CLI Smoketests (no interfaces) 👍 passed
• CLI Smoketests (interfaces only) 👍 passed
• Config tests 👍 passed
• RAID1 tests 👍 passed
• TPM tests 👍 passed