Mount the ca-certificates directory

Change-Id: I5116290ec053b0b5edf9411466dd8722aa654181
diff --git a/roles/maas/templates/automation-compose.yml.j2 b/roles/maas/templates/automation-compose.yml.j2
index 3fb4747..7b3df39 100644
--- a/roles/maas/templates/automation-compose.yml.j2
+++ b/roles/maas/templates/automation-compose.yml.j2
@@ -60,6 +60,7 @@
       - "PROVISION_LOG_FORMAT=text"
     volumes:
       - "/etc/maas/ansible:/etc/maas/ansible"
+      - "/usr/local/share/ca-certificates:/usr/local/share/ca-certificates"
       - "/etc/maas/.ssh:/etc/maas/.ssh"
     restart: unless-stopped