feat: implement builds:output

This still needs tightening to ensure we don't trigger this for normal git plugin commands - as well as anything that triggers a deploy - but works in a pinch.

dokku

@@ -188,6 +188,10 @@ execute_dokku_cmd() {
     set -- "$PLUGIN_CMD" "$@"
   fi
 
+  if [[ $PLUGIN_NAME =~ git-* ]] || [[ $PLUGIN_NAME =~ git:* ]]; then
+    exec &> >(tee >(tee | logger -i -t "dokku-${DOKKU_PID}"))
+  fi
+
   if [[ -x $PLUGIN_ENABLED_PATH/$PLUGIN_NAME/subcommands/default ]]; then
     "$PLUGIN_ENABLED_PATH/$PLUGIN_NAME/subcommands/default" "$@"
     implemented=1