Use the correct ssh key for DO when running on ci server

test/selfhost-digitalocean-test.js

@@ -26,7 +26,7 @@ require('colors');
 process.env.NODE_TLS_REJECT_UNAUTHORIZED = '0';
 const BOX_VERSION = process.env.BOX_VERSION;
 const DO_SELFHOST_DOMAIN = process.env.DO_SELFHOST_DOMAIN;
-const SSH_KEY = 'caas_staging';
+const SSH_KEY = 'id_rsa_e2e_selfhost';
 const DO_TYPE = '1gb';
 const DO_REGION = 'nyc3';
 const DO_TOKEN = process.env.DIGITAL_OCEAN_TOKEN_STAGING;