Have role make deployed IOC a git repo, and commit any changes on deployment. Add role for performing rollbacks to previous deployments

[jwlodek]

All deployments will now be git repositories so that changes are tracked from deployment to deployment. This will also allow for easier rollbacks to previous deployments. A helper role to perform rollbacks is also added.

[Copilot]

Pull request overview

This PR makes deployed IOC directories self-contained git repositories so each deployment can be tracked/compared over time, and introduces a new Ansible role to roll back an IOC deployment by resetting the repository to a previous commit.

Changes:

• Initialize a git repository (if needed) in the IOC deploy directory and attempt to commit deployment changes.
• Add a new rollback_deployment role that verifies repo state and performs git reset --hard to roll back N commits.
• Document rollback role variables and provide defaults for IOC directory layout.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 9 comments.

File	Description
roles/deploy_ioc/tasks/deploy-ioc.yml	Adds git init/add/commit steps to record deployment deltas in the IOC directory.
roles/rollback_deployment/tasks/main.yml	Implements rollback flow: repo checks, clean-tree requirement, commit-count gate, hard reset.
roles/rollback_deployment/defaults/main.yml	Adds default base paths and rollback step count.
roles/rollback_deployment/README.md	Documents role purpose and inputs.

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[johnsinsheimer]

Right now, I think deployment basically ignores autosave files. I think the git change tracking is a nice idea, but maybe we should ignore autosave files. On the other hand, adding/removing PVs with autosave from new deployments could possibly get complicated.