Add resiliency tests (#20786)

docs/resiliency/resiliency-verify-failure-script.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+
+echo "script failed" >resiliency-verify-failure.log # assume initial state
+
+ALIAS_NAME=myminio
+BUCKET="test-bucket"
+DEST_DIR="/tmp/dest"
+
+OUT=$(./mc cp --quiet --recursive "${ALIAS_NAME}"/"${BUCKET}"/initial-data/ "${DEST_DIR}"/)
+RET=${?}
+if [ ${RET} -ne 0 ]; then
+	# It is a success scenario as get objects should fail
+	echo "GET objects failed as expected"
+	echo "script passed" >resiliency-verify-failure.log
+	exit 0
+else
+	echo "GET objects expected to fail, but succeeded: ${OUT}"
+fi