Add comprehensive documentation and improve container configuration

- Add technical report on Debian atomic image creation
- Add Fedora tools bootable instructions and implementation report
- Add apt-tool blocking implementation documentation
- Add environment configuration example
- Update .gitignore with better artifact blocking
- Update justfile and Containerfile configurations
- Improve variants configuration for debian-bootc-base

.gitignore

@@ -6,4 +6,37 @@ deb_packages
 
 # Testing artifacts that should not be committed
 work
-*.deb
+*.deb
+
+# Environment files with credentials
+.env
+
+# Build artifacts
+output/
+*.qcow2
+*.iso
+*.raw
+
+# Temporary files
+*.tar
+*.tmp
+
+# Python
+__pycache__/
+*.pyc
+*.pyo
+*.pyd
+.Python
+env/
+venv/
+.venv/
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+
+# OS
+.DS_Store
+Thumbs.db