Refactor Docker Compose examples and plugins, add pytest tests

- Adjusted Compose files to build images locally instead of pulling.
- Simplified examples by removing `/etc/hosts` entry instructions.
- Enhanced `cloudflare.py` plugin with a configurable log format.
- Improved `generate-keys.sh` for portability using `$SCRIPT_DIR`.
- Added end-to-end tests for Compose examples using pytest.

pyproject.toml

@@ -39,6 +39,8 @@ dev = [
     "pytest>=9.0.2",
     "pytest-cov>=4.1.0",
     "ruff>=0.1.0",
+    "PyJWT>=2.8.0",
+    "cryptography>=41.0.0",
 ]
 
 [project.scripts]