[OTA] Enable 2 clicks OTA update / one simple MQTT command (#1485)

* [OTA] Add automatic OTA updates

This feature will enable to update the gateway with one button or a simple MQTT command.

* [CI] Enable automatic OTA for nightly development builds

And integrate the latest_version file creation into the CI

Enable to specify a particular version
and switch between dev and production builds

scripts/latest_version_dev.json

@@ -0,0 +1,4 @@
+{
+    "latest_version": "version_tag",
+    "title": "OpenMQTTGateway Nightly (TEST ONLY) version_tag",
+}