Refactor golden image handling in backup upload process</message>

<message>Update the _set_golden_from_path function to improve the handling of existing golden image files. Replace the existing unlink logic with a more robust method that safely removes files or broken symlinks using the missing_ok parameter. This change enhances the reliability of the backup upload process by ensuring that stale references are properly cleared before setting a new golden image path.

backup-from-device/gnss-guard/tm-gnss-guard/server/.dockerignore

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+# Git
+.git
+.gitignore
+
+# Python
+__pycache__
+*.py[cod]
+*$py.class
+*.so
+.Python
+*.egg-info
+dist
+build
+.venv
+venv
+
+# Environment files (uploaded separately)
+.env
+.env.*
+env.example
+
+# Docker
+Dockerfile
+docker-compose*.yml
+.dockerignore
+
+# IDE
+.vscode
+.idea
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+
+# SSH keys
+.cert/
+*.pem
+
+# Logs
+*.log
+logs/
+
+# Data
+data/
+*.db
+