diff --git a/nixpacks.toml b/nixpacks.toml
index 61efc69..7a98ab3 100644
--- a/nixpacks.toml
+++ b/nixpacks.toml
@@ -1,2 +1,5 @@
 [phases.install]
 aptPkgs = ["...", "build-essential"]
+
+[phases.build]
+cmds = ["mix compile", "mix ecto.setup", "pushd assets && npm install && popd"]