Don't compile libs in prod

Author: lpil

rebar.config

@@ -3,10 +3,13 @@
 
 {profiles, [
     {test, [
-        {src_dirs, ["src", "gen/src", "gen/test"]}
+        {pre_hooks, [{compile, "gleam build ."}]},
+        {src_dirs, ["src", "test", "gen/src", "gen/test"]}
+    ]},
+
+    {dev, [
+        {pre_hooks, [{compile, "gleam build ."}]}
     ]}
 ]}.
 
-{pre_hooks, [{compile, "gleam build ."}]}.
-
 {deps, []}.