chore: add more comments in 'dig command'

Author: kgala2

.ci/cloudbuild.yaml

@@ -21,8 +21,14 @@ steps:
     - |
         apt-get update
         apt-get install dnsutils -y
-        echo "dig ${_DNS_NAME} ..."
+        echo "dig ${_DNS_NAME} ... (with +trace)"
+        dig +trace ${_DNS_NAME}
+        echo "dig ${_DNS_NAME} ... (without +trace)"
         dig ${_DNS_NAME}
+        echo "cat /etc/resolv.conf"
+        cat /etc/resolv.conf
+        echo "ip route"
+        ip route
 
   - id: run integration tests
     name: python:${_VERSION}