Refactor E2E tests and configuration format

- Replaced `easymapping` configuration with `containers` for better maintainability and clarity.
- Introduced `DockerComposeFixture` class in `utils.py` to manage Docker Compose lifecycle and smart build strategy.
- Enhanced YAML-to-environment variable conversion in `ContainerEnv` for dynamic configuration support.
- Updated HAProxy configurations and test fixtures to reflect the new format.
- Improved test coverage for YAML parsing, environment variable handling, and HAProxy config generation.

tests_e2e/static/conf/config-certbot.yml

@@ -35,54 +35,48 @@ stats:
 
 customerrors: true
 
-easymapping:
+containers:
   # HTTP Port 80
   # Required for ACME HTTP-01 challenge and redirect
-  - port: 80
-    hosts:
-      # Domain with certbot enabled
-      example.com:
-        containers:
-          - webapp:8080
-        # Enable certbot for this domain
-        certbot: true
-        # Redirect HTTP to HTTPS after cert is issued
-        redirect_ssl: true
 
-      # Additional domain with certbot
-      app.example.com:
-        containers:
-          - app:3000
-        certbot: true
-        redirect_ssl: true
+  # Domain with certbot enabled
+  "example.com:80":
+    ip: ["webapp:8080"]
+    # Enable certbot for this domain
+    certbot: true
+    # Redirect HTTP to HTTPS after cert is issued
+    redirect_ssl: true
 
-      # Domain without certbot (uses custom certificate)
-      custom.example.com:
-        containers:
-          - custom-app:8080
-        # No certbot - expects certificate at /certs/haproxy/custom.example.com.pem
+  # Additional domain with certbot
+  "app.example.com:80":
+    ip: ["app:3000"]
+    certbot: true
+    redirect_ssl: true
+
+  # Domain without certbot (uses custom certificate)
+  "custom.example.com:80":
+    ip: ["custom-app:8080"]
+    # No certbot - expects certificate at /certs/haproxy/custom.example.com.pem
 
   # HTTPS Port 443
   # Serves HTTPS traffic with auto-generated certificates
-  - port: 443
+
+  "example.com:443":
+    ip: ["webapp:8080"]
     ssl: true
-    hosts:
-      example.com:
-        containers:
-          - webapp:8080
-        # Certificate path (auto-generated by certbot)
-        # /certs/certbot/example.com/fullchain.pem
+    # Certificate path (auto-generated by certbot)
+    # /certs/certbot/example.com/fullchain.pem
 
-      app.example.com:
-        containers:
-          - app:3000
+  "app.example.com:443":
+    ip: ["app:3000"]
+    ssl: true
 
-      # Custom certificate example
-      custom.example.com:
-        containers:
-          - custom-app:8080
-        # Place your certificate at:
-        # /certs/haproxy/custom.example.com.pem
+  # Custom certificate example
+  "custom.example.com:443":
+    ip: ["custom-app:8080"]
+    ssl: true
+    # Place your certificate at:
+    # /certs/haproxy/custom.example.com.pem
 
 # Multiple domains with different backends
 # Certbot will request separate certificates for each domain