onPreBuild is the event we want.

Stoopid AI.

https://docs.netlify.com/build-plugins/create-plugins/#plug-into-events

Author: dcolebatch

netlify.toml

@@ -10,7 +10,7 @@
   skip_processing = true
 
 [build.lifecycle]
-  onBuild = "uname -a && gcc --version && sudo apt-get update && sudo apt-get install -y build-essential"
+  onPreBuild = "echo 'onPreBuild lifecycle event started' && uname -a && gcc --version && sudo apt-get update && sudo apt-get install -y build-essential"
 
 [[plugins]]
   package = "@netlify/plugin-ruby-bundler"