Remove infra upgrade logic

We now upgrade using the dumps of the last backups which are in the
filesystem itself instead of downloading the entire app from the
backup all over.

src/infra_version.js

@@ -5,14 +5,12 @@
 // Do not require anything here!
 
 exports = module.exports = {
-    // a major version makes all apps restore from backup. #451 must be fixed before we do this.
-    // a minor version makes all apps re-configure themselves
+    // a version change recreates all containers with latest docker config
     'version': '48.12.0',
 
     'baseImages': [ 'cloudron/base:1.0.0@sha256:147a648a068a2e746644746bbfb42eb7a50d682437cead3c67c933c546357617' ],
 
-    // Note that if any of the databases include an upgrade, bump the infra version above
-    // This is because we upgrade using dumps instead of mysql_upgrade, pg_upgrade etc
+    // a major version bump in the db containers will trigger the restore logic that uses the db dumps
     // docker inspect --format='{{index .RepoDigests 0}}' $IMAGE to get the sha256
     'images': {
         'mysql': { repo: 'cloudron/mysql', tag: 'cloudron/mysql:2.0.0@sha256:1c177c3fa079695aea13cec6daf52b772f400022131f31e8da237f55d683d9f4' },