fix: make Caddy route upsert robust against missing/invalid routes

- Add --fail to the GET so a 404 (no 'hiy' server yet, stale volume)
  falls back to [] instead of passing error JSON to Python
- Python now guards against non-list responses with try/except
- Always re-append the dashboard catch-all route so it survives
  even when routes are rebuilt from scratch

builder/build.sh

@@ -126,17 +126,25 @@ if curl --silent --fail "${CADDY_API}/config/" >/dev/null 2>&1; then
 EOF
 )
     # Upsert the route for this app.
-    ROUTES=$(curl --silent "${CADDY_API}/config/apps/http/servers/hiy/routes" 2>/dev/null || echo "[]")
-    # Remove existing route for the same host, then append the new one.
+    ROUTES=$(curl --silent --fail "${CADDY_API}/config/apps/http/servers/hiy/routes" 2>/dev/null || echo "[]")
+    # Remove existing route for the same host, rebuild list, keep dashboard as catch-all.
     UPDATED=$(echo "$ROUTES" | python3 -c "
 import sys, json
-routes = json.load(sys.stdin)
+try:
+    routes = json.loads(sys.stdin.read())
+    if not isinstance(routes, list):
+        routes = []
+except Exception:
+    routes = []
+DASHBOARD = {'handle': [{'handler': 'reverse_proxy', 'upstreams': [{'dial': 'server:3000'}]}]}
 new_host = '${APP_ID}.${DOMAIN_SUFFIX}'
+# Keep host-matched routes that are NOT for this app
 routes = [r for r in routes
-          if not (isinstance(r, dict)
-                  and any(isinstance(m, dict) and new_host in m.get('host', [])
-                          for m in r.get('match', [])))]
+          if r.get('match') and not any(
+              isinstance(m, dict) and new_host in m.get('host', [])
+              for m in r.get('match', []))]
 routes.insert(0, json.loads(sys.argv[1]))
+routes.append(DASHBOARD)
 print(json.dumps(routes))
 " "$ROUTE_JSON")