Docker file fix and version in docker return proper envvar

src/lib/version.js

@@ -2,8 +2,8 @@ const fs = require('fs');
 
 
 const version = () => {
-    if (process.env.VERSION) {
-        return process.env.VERSION;
+    if (process.env.APP_VERSION) {
+        return process.env.APP_VERSION;
     }
     // Fallback to reading from a VERSION file
     const versionPath = require('path').resolve(__dirname, '../../VERSION');