arm64 and amd64 image support (#88)

* Ability to build arm7 docker image using buildx

* Build arm64 and amd64 images

src/server.ts

@@ -169,7 +169,7 @@ function server(
           removeRegistrationRoute: bonobUrl
             .append({ pathname: REMOVE_REGISTRATION_ROUTE })
             .pathname(),
-          version: opts.version,
+          version: serverOpts.version || DEFAULT_SERVER_OPTS.version,
         });
       }
     );