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.

examples/docker/docker-compose.yml

@@ -9,9 +9,6 @@
 # - HAProxy stats interface
 #
 # REQUIREMENTS (run these first):
-# ```bash
-# # Add to /etc/hosts (idempotent)
-# grep -q "host1.local" /etc/hosts || echo "127.0.0.1 host1.local host2.local" | sudo tee -a /etc/hosts
 #
 # # Generate SSL certificates
 # cd ../.. && ./examples/generate-keys.sh && cd examples/docker
@@ -51,7 +48,10 @@
 
 services:
   haproxy:
-    image: byjg/easy-haproxy:5.0.0
+    build:
+      context: ../..
+      dockerfile: build/Dockerfile
+    image: byjg/easy-haproxy:local
     volumes:
       - /var/run/docker.sock:/var/run/docker.sock
       - ./host2.local.pem:/certs/haproxy/host2.local.pem