provision: delay initialization of secrets until provision time

when we create the DO 1-click image, the key also gets snapshotted.

https://community.letsencrypt.org/t/receiving-expiration-emails-for-dozens-of-domains/165441

src/provision.js

@@ -10,6 +10,7 @@ exports = module.exports = {
 const assert = require('assert'),
     backups = require('./backups.js'),
     backuptask = require('./backuptask.js'),
+    blobs = require('./blobs.js'),
     BoxError = require('./boxerror.js'),
     branding = require('./branding.js'),
     constants = require('./constants.js'),
@@ -61,6 +62,7 @@ async function setupTask(domain, auditSource) {
     assert.strictEqual(typeof auditSource, 'object');
 
     try {
+        await blobs.initSecrets();
         await cloudron.setupDnsAndCert(constants.DASHBOARD_LOCATION, domain, auditSource, (progress) => setProgress('setup', progress.message));
         await cloudron.setDashboardDomain(domain, auditSource);
         setProgress('setup', 'Done'),