improve webhook curl

backend/out.json

@@ -0,0 +1 @@
+{"completed":true,"result":{"error":{"name":"Exception","stack":"  File \"/tmp/u/ruben/gentle_script.py\", line 35, in main\n    print(wmill.get_variable(\"u/admin/adorable_postgresql\"))\n          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n\n  File \"/tmp/windmill/cache/pip/wmill==1.166.0/wmill/client.py\", line 336, in get_variable\n    raise Exception(\n","message":"Variable at path u/admin/adorable_postgresql does not exist or you do not have read permissions on it"}}}

frontend/src/lib/components/details/WebhooksPanel.svelte

@@ -174,10 +174,10 @@ ${
 		: `
 URL="${$page.url.origin}/api/w/${$workspaceStore}/jobs_u/completed/get_result_maybe/$UUID"
 while true; do
-  RESPONSE=$(curl -s -H "Authorization: Bearer $TOKEN" $URL)
-  COMPLETED=$(echo $RESPONSE | jq .completed)
+  curl -s -H "Authorization: Bearer $TOKEN" $URL -o res.json
+  COMPLETED=$(cat res.json | jq .completed)
   if [ "$COMPLETED" = "true" ]; then
-    echo $RESPONSE | jq .result
+    cat res.json | jq .result
     break
   else
     sleep 1