Add zero-config self hosting on Render (#612)

* v1 of backend implementation for self hosting

* Add docs

* Add upgrades controller

* Add global helpers for self hosting mode

* Add self host settings controller

* Conditionally show self hosting settings

* Environment and config updates

* Complete upgrade prompting flow

* Update config for forked repo

* Move configuration of github provider within class

* Add upgrades cron

* Update deploy button

* Update guides

* Fix render deployer

* Typo

* Enable auto upgrades

* Fix cron

* Make upgrade modes more clear and consistent

* Trigger new available version

* Fix logic for displaying upgrade prompts

* Finish implementation

* Fix regression

* Trigger new version

* Add i18n translations

* trigger new version

* reduce caching time for testing

* Decrease cache for testing

* trigger upgrade

* trigger upgrade

* Only trigger deploy once

* trigger upgrade

* If target is commit, always upgrade if any upgrade is available

* trigger upgrade

* trigger upgrade

* Test release

* Change back to maybe repo for defaults

* Fix lint errors

* Clearer naming

* Fix relative link

* Add abs path

* Relative link

* Update docs

config/locales/views/shared/en.yml

@@ -20,3 +20,9 @@ en:
         and account graphs.</p></br><p>The only way you’ll be able to add this entry
         back is by re-entering it manually via a new entry</p>"
       title: Delete Entry?
+  shared:
+    upgrade_notification:
+      app_upgraded: The app has been upgraded to %{version}.
+      dismiss: Dismiss
+      new_version_available: A new version of Maybe is available for upgrade.
+      upgrade_now: Upgrade Now