Enable boot-from-volume for the charm pools

Change-Id: If542ed52b0d9e9cf0f360e4640468ae4ffa62e35
diff --git a/nodepool/nodepool.yaml b/nodepool/nodepool.yaml
index cdc1810..d0cb9e1 100644
--- a/nodepool/nodepool.yaml
+++ b/nodepool/nodepool.yaml
@@ -83,6 +83,7 @@
             flavor-name: m1.small
             cloud-image: ubuntu-focal
             key-name: spfactory-zuul-nodepool-key
+            boot-from-volume: True
       - name: charm-zaza
         max-servers: 1
         auto-floating-ip: False
@@ -96,5 +97,6 @@
             flavor-name: m1.small
             cloud-image: ubuntu-focal
             key-name: spfactory-zuul-nodepool-key
+            boot-from-volume: True
     clean-floating-ips: False
     port-cleanup-interval: 0