add jq dep for vault script

can't use snap jq as it doesn't read from tmp file
so we install from apt

tools/vault-unseal-and-authorise.sh

@@ -3,6 +3,7 @@
 . $(dirname $0)/../common/juju_helpers
 
 which vault > /dev/null || sudo snap install vault
+which jq > /dev/null || sudo snap install jq
 
 model=`juju show-model --format=json| jq -r '.| keys[]'`
 model_uuid=`juju show-model --format=json| jq -r '.[]."model-uuid"'`