Allow to set version via environment variable

The version is displayed on the HTML-based landing page.

configuration/config.go

@@ -12,6 +12,8 @@ const BODY_SIZE_LIMIT = 32 * 1024 * 1024    // 32 MB, in bytes
 
 
 type Config struct {
+    Version     string `env:"VERSION"   envDefault:"N/A"`
+
     Environment string `env:"ENV_NAME" envDefault:"development"`
     Host        string `env:"HOST" envDefault:"127.0.0.1"`
     Port        int16  `env:"PORT" envDefault:"3000"`

routing/routes.go

@@ -34,7 +34,7 @@ func SetRoutes( router *f.App, config *configuration.Config, store state.Store,
         }
 
         data := indexHtmlData{
-            Version: "",
+            Version: config.Version,
             Color: "",
         }