Switch git backend to pygit2 (uses libgit2)

[mahaloz]

Description

The tile says it all.

Alternatives

No response

Additional context

No response

[mahaloz]

Closing this issue should also close #328. Here is the PoC code:

import pygit2

# Path to your Git repository
repo_path = './path/to/repo'
repo = pygit2.Repository(repo_path)

# Fetch updates from the remote
remote_name = 'origin'
remote = repo.remotes[remote_name]
remote.fetch()

# Iterate through the local branches and reset them to the corresponding remote tracking branch
for branch in repo.branches.local:
    remote_branch_name = f'{remote_name}/{branch}'
    remote_branch = repo.branches[remote_branch_name]
    local_branch = repo.branches[branch]
    
    # Reset the local branch to the corresponding remote tracking branch
    repo.branches.update(local_branch.name, remote_branch.target)