[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

platformio.ini

@@ -177,6 +177,7 @@ lib_deps =
   ${env.lib_deps}
 build_flags =
   ${env.build_flags}
+  '-DENV_NAME="$PIOENV"'
   '-DZmqttDiscovery="HADiscovery"'
   '-DTRACE=1'
   '-DCONFIG_BT_NIMBLE_ROLE_PERIPHERAL_DISABLED'