dev: only build server with bra run

.bra.toml

@@ -12,6 +12,6 @@ watch_dirs = [
 watch_exts = [".go", ".ini", ".toml"]
 build_delay = 1500
 cmds = [
-  ["go", "run", "build.go", "-dev", "build"],
+  ["go", "run", "build.go", "-dev", "build-server"],
 	["./bin/grafana-server", "cfg:app_mode=development"]
 ]