feat: add git reset and clean before nightly and release updates, fixes #646

Add hard reset and clean operations to ensure a clean working directory
before switching branches or checking out release tags. This prevents
local changes from interfering with the update process and ensures
consistent behavior across both nightly and release update paths.

py/routes/update_routes.py

@@ -344,6 +344,11 @@ class UpdateRoutes:
             origin.fetch()
             
             if nightly:
+                # Reset to discard any local changes
+                repo.git.reset('--hard')
+                # Clean untracked files
+                repo.git.clean('-fd')
+                
                 # Switch to main branch and pull latest
                 main_branch = 'main'
                 if main_branch not in [branch.name for branch in repo.branches]:
@@ -357,6 +362,11 @@ class UpdateRoutes:
                 new_version = f"main-{repo.head.commit.hexsha[:7]}"
                 
             else:
+                # Reset to discard any local changes
+                repo.git.reset('--hard')
+                # Clean untracked files
+                repo.git.clean('-fd')
+                
                 # Get latest release tag
                 tags = sorted(repo.tags, key=lambda t: t.commit.committed_datetime, reverse=True)
                 if not tags: