Allow compliance run with read-only git token

[gneville-ot]

Environment

• Nautobot version: 2.3.4
• nautobot-golden-config version: 2.1.2

Proposed Functionality

Allow a compliance run to work without the need to push to the git repos so a read-only git token can be used.

Use Case

Use existing intended and backup git repos that nautobot only has read-only access to and still allow a compliance run to be performed with out errors.

Extra:

We have other processes that provide the intended and backup configs that nautobot can consume, we don't want nautobot to perform any push to those repos. At the end of a compliance run the "GC Repo Commit and Push" is attempted and effectively just pushes an empty commit which isn't needed for this use case.

[gsnider2195]

I think we need a setting to disable pushing the configs