Add IngressClass resource and update references to spec.ingressClassName across templates, examples, and documentation for consistency and backward compatibility

- Introduced new IngressClass resource in Helm templates to define `easyhaproxy` as the default ingress class.
- Updated Kubernetes examples to replace `easyhaproxy-ingress` with `easyhaproxy` as the ingress class name.
- Enhanced processor logic to support both the new `spec.ingressClassName` field and the deprecated `kubernetes.io/ingress.class` annotation.
- Revised documentation to reflect the changes and ensure alignment with Kubernetes recommendations.

src/processor/__init__.py

@@ -241,16 +241,21 @@ class Kubernetes(ProcessorInterface):
         for ingress in ret.items:
             # Support both new spec.ingressClassName and deprecated annotation for backward compatibility
             ingress_class = None
+            is_match = False
 
             # Check new spec.ingressClassName first (preferred)
             if hasattr(ingress.spec, 'ingress_class_name') and ingress.spec.ingress_class_name is not None:
                 ingress_class = ingress.spec.ingress_class_name
+                # Modern spec uses 'easyhaproxy'
+                is_match = (ingress_class == "easyhaproxy")
             # Fall back to deprecated annotation
             elif ingress.metadata.annotations and 'kubernetes.io/ingress.class' in ingress.metadata.annotations:
                 ingress_class = ingress.metadata.annotations['kubernetes.io/ingress.class']
+                # Deprecated annotation uses 'easyhaproxy-ingress' for backward compatibility
+                is_match = (ingress_class == "easyhaproxy-ingress")
 
             # Skip if no ingress class is defined or it doesn't match
-            if ingress_class != "easyhaproxy-ingress":
+            if not is_match:
                 continue
 
             ssl_hosts = []