dev: only build server with bra run

.bra.toml

@@ -1,6 +1,6 @@
 [run]
 init_cmds = [
-  ["go", "run", "build.go", "build"],
+  ["go", "run", "build.go", "build-server"],
 	["./bin/grafana-server", "cfg:app_mode=development"]
 ]
 watch_all = true