Excessive "New version available" message

[estellecomment]

The message announcing a new version, with a button for upgrading, keeps showing up for no reason.
There is probably something wrong with the way the versions are managed, so that there is a mismatch between what the version checker sees and what it thinks is the current version. Something like that.

Places to look :

• the /version file : where is it written ? Does that write happen properly in our deployments ?
• the version numbers in the package.json files : are we using element's versions, tchap's versions, is there a messup there ?

[estellecomment]

In logs : startUpdater, current version is !!UNSET!!

The value is in process.env.VERSION. In the webpack config :

if (!process.env.VERSION) {
    console.warn("Unset VERSION variable - this may affect build output");
    process.env.VERSION = "!!UNSET!!";
}

We need to set the VERSION env var on scalingo.

The deploy script package-scalingo-prod.sh does find the right version number in $version, but doesn't export it to VERSION.
Find where this is done in element's build, and add it at the same place, or in package-scalingo-prod.sh