Add Kubernetes integration tests for EasyHAProxy examples

- Introduced a suite of pytest-based integration tests for Kubernetes using `kind`.
- Automated local installation of dependencies (`kind`, `kubectl`, and `helm`) when missing.
- Implemented fixtures for Kubernetes resource management and TLS secrets.
- Added end-to-end tests for HTTP and HTTPS ingress functionality.

examples/kubernetes/teardown-cluster.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+
+# Colors for output
+GREEN='\033[0;32m'
+BLUE='\033[0;34m'
+RED='\033[0;31m'
+NC='\033[0m' # No Color
+
+CLUSTER_NAME="easyhaproxy-test"
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+BIN_DIR="${SCRIPT_DIR}/.kind"
+KIND_BIN="${BIN_DIR}/kind"
+
+# Check if kind binary exists
+if [ ! -f "${KIND_BIN}" ]; then
+    # Try to use system kind
+    if command -v kind &> /dev/null; then
+        KIND_BIN="kind"
+    else
+        echo -e "${RED}✗ kind binary not found. Cannot delete cluster.${NC}"
+        echo "  Cluster may not exist or kind is not installed."
+        exit 1
+    fi
+fi
+
+# Check if cluster exists
+if ! ${KIND_BIN} get clusters 2>/dev/null | grep -q "^${CLUSTER_NAME}$"; then
+    echo -e "${BLUE}Cluster '${CLUSTER_NAME}' does not exist. Nothing to delete.${NC}"
+    exit 0
+fi
+
+echo -e "${BLUE}Deleting kind cluster '${CLUSTER_NAME}'...${NC}"
+
+if ${KIND_BIN} delete cluster --name "${CLUSTER_NAME}"; then
+    echo -e "${GREEN}✓ Cluster deleted successfully${NC}"
+else
+    echo -e "${RED}✗ Failed to delete cluster${NC}"
+    exit 1
+fi