Add script for deleting all brev instances.

Author: brycelelbach

build/brev-delete-instances.bash

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+INSTANCES=$(brev list | tail -n +3 | awk '{print $1}' | tr '\n' ' ')
+
+if [ -n "${INSTANCES}" ]; then
+    brev delete ${INSTANCES}
+else
+    echo "No instances found"
+fi