chore: add .dockerignore for Docker security

Author: nikolay-e

.dockerignore

@@ -0,0 +1,101 @@
+# Git
+.git
+.gitignore
+.gitattributes
+.github/
+
+# Python artifacts
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# Virtual environments
+venv/
+env/
+ENV/
+.venv/
+
+# Testing and coverage
+.coverage
+.coverage.*
+*.cover
+htmlcov/
+.pytest_cache/
+.tox/
+.nox/
+
+# Type checking and linting
+.mypy_cache/
+.ruff_cache/
+.dmypy.json
+
+# Mutation testing
+.mutmut-cache
+mutants/
+
+# IDE and editors
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+.vim/
+
+# OS files
+.DS_Store
+Thumbs.db
+.AppleDouble
+
+# Secrets and environment
+.env
+.env.*
+!.env.example
+*.pem
+*.key
+*id_rsa*
+*id_ed25519*
+credentials.json
+secrets.json
+.secrets.baseline
+
+# Documentation (not needed in image)
+*.md
+!README.md
+docs/
+site/
+
+# Build artifacts
+release-*/
+*.bundle
+
+# Tree mapper output
+tree.tmp
+directory_tree.yaml
+
+# PyInstaller
+*.spec
+
+# Claude AI tools
+.claude/
+
+# CI/CD
+.pre-commit-config.yaml
+renovate.json