Add retry logic for flaky connectivity tests in boutique

Network connections can be flaky in CI, especially with many pods.
Retry up to 3 times for expected "allow" cases before failing.

Author: fenio

examples/kind-lab-boutique/test-connectivity.sh

@@ -71,11 +71,25 @@ test_connection() {
     local expected=$4  # "allow" or "deny"
     local description=$5
     local pod_name="test-${from_app}"
+    local max_retries=3
+    local connected=false
 
     echo -n "Testing: $description... "
 
-    # Test connection with timeout
-    if kubectl exec -n "$NAMESPACE" "$pod_name" -- nc -zv -w 3 "$to_svc" "$to_port" >/dev/null 2>&1; then
+    # Test connection with retries for expected "allow" cases (network can be flaky)
+    for i in $(seq 1 $max_retries); do
+        if kubectl exec -n "$NAMESPACE" "$pod_name" -- nc -zv -w 3 "$to_svc" "$to_port" >/dev/null 2>&1; then
+            connected=true
+            break
+        fi
+        if [ "$expected" = "allow" ] && [ $i -lt $max_retries ]; then
+            sleep 1
+        else
+            break
+        fi
+    done
+
+    if [ "$connected" = true ]; then
         if [ "$expected" = "allow" ]; then
             echo -e "${GREEN}PASS${NC} (connected as expected)"
         else