I do not understand your question unfortunately.
The way we export/transfer applications is via the web interface. You create your app and then export it as a *.rei3 file; this file can then be imported in other REI3 systems either directly or via repository. This is the "whole" application as REI3 understands it. And you can package and even sell this application if you want, to anyone who runs a REI3 system.
Go is the language the server is written in. A complete REI3 instance needs much more than Go however. It requires the server (written in Go), the frontend components (web files), a database (Postgres) as well as external dependencies (ImageMagick, Ghostscript, ...). You could design your app in a specific REI3 system and then package everything together (database, server, dependencies) and ship this as a software solution; this is how the portable version of REI3 works. It would be possible to do on Windows at least but what would be the benefit?
Please let me know what you meant, because it is not very clear to me.