Enabling testing inside Docker container

.gitignore

@@ -1,7 +1,44 @@
-app/__pycache__
-__pycache__
-.pytest_cache/
+# Environment variables
+.env
+.env.local
+.env.*
+
+# Keep the example file for setup instructions
+!.env.example
+
+# Virtual environments
 venv/
+.env/
+
+# Python bytecode and cache
+__pycache__/
+*.pyc
+*.pyo
+*.pyd
+.python-version
+
+# Pytest cache
+.pytest_cache/
+
+# IDE/editor files
+.vscode/
+.idea/
+*.swp
+*.swo
+
+# Docker-related files
+*.log
+docker-compose.override.yml
+
+# Coverage reports
+htmlcov/
+.coverage
+coverage.xml
+
+# Logs
+*.log
+
+# Extras
 test.txt
 diff.txt
 test.db