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-cloudflare.yml

@@ -15,8 +15,7 @@
 # echo "" >> cloudflare_ips.lst
 # curl -s https://www.cloudflare.com/ips-v6 >> cloudflare_ips.lst
 #
-# # Add to /etc/hosts (idempotent)
-# grep -q "myapp.local" /etc/hosts || echo "127.0.0.1 myapp.local" | sudo tee -a /etc/hosts
+
 # ```
 #
 # HOW TO START:
@@ -47,7 +46,10 @@
 
 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
       # Mount Cloudflare IP list
@@ -62,11 +64,9 @@ services:
       - "80:80/tcp"
       - "1936:1936/tcp"
 
-  # Web application behind Cloudflare
+  # Web application behind Cloudflare (header-echo server for testing)
   webapp:
-    image: byjg/static-httpserver
-    environment:
-      TITLE: "App Behind Cloudflare"
+    build: ./python-app
     labels:
       easyhaproxy.http.host: myapp.local
       easyhaproxy.http.port: 80