Fix detection of forgehook user

webhook

@@ -2,9 +2,11 @@
 
 # Auto-detect owner of webhook-backend on current system
 # stat has different syntax on various system so we use find
-# TODO: if we don't find webhook-backend, we should error
-bin="$(which webhook-backend)"
-owner=$(find $bin -maxdepth 0 -printf '%u')
+owner=$(find /usr/local/bin/webhook-backend -maxdepth 0 -printf '%u')
+if [[ $? != 0 ]]; then
+    echo "FATAL ERROR: webhook-backend not found in /usr/local/bin"
+    exit 1
+fi
 
 # Start the backend escalating privileges to its owner
 # TODO: introduce timeout on a dummy sudo to check sudo rules