k3d dev script: add volumes to support twistlock defenders

General MR

Summary

Changes:

• Splits up the default args for k3d to improve readability + add comments on each option.
• Adds/modifies volumes to support Twistlock defenders - volumes will always be mounted to the k3d nodes but only used if defenders are deployed.
• Adds new SSH arg -o IdentitiesOnly=yes to ensure that only the identity passed in is used, preventing potential SSH errors

docs/assets/scripts/developer/k3d-dev.sh

@@ -115,7 +115,7 @@ while [ -n "$1" ]; do # while loop starts
       echo " -b   use BIG M5 instance. Default is t3.2xlarge"
       echo " -p   use private IP for security group and k3d cluster"
       echo " -m   create k3d cluster with metalLB"
-	  echo " -d   destroy related AWS resources"
+      echo " -d   destroy related AWS resources"
       echo " -h   output help"
       exit 0
   ;;