F5: fix uptime-kuma healthcheck (v2 uses compiled extra/healthcheck binary)

The override pointed at a v1-era node /app/extra/healthcheck.mjs that does not
exist in louislam/uptime-kuma:2, so the container was permanently unhealthy and
Traefik withheld the route → the app URL 404'd despite the app running. Point at
the correct binary (extra/healthcheck, WORKDIR /app) and use the image's timing
(180s start_period) to avoid transient unhealthy→404 on first boot.

templates/uptime-kuma/docker-compose.yml

@@ -21,12 +21,16 @@ services:
       resources:
         limits:
           memory: 256M
+    # uptime-kuma:2 ships its healthcheck as a compiled binary at /app/extra/healthcheck (WORKDIR /app);
+    # the old override pointed at a v1-era /app/extra/healthcheck.mjs that does NOT exist in v2, so the
+    # container stayed permanently "unhealthy" → Traefik withheld the route → the URL 404'd although the
+    # app was running (F5). Use the correct binary and the image's own timing (180s first-boot window).
     healthcheck:
-      test: ["CMD", "node", "/app/extra/healthcheck.mjs"]
+      test: ["CMD", "extra/healthcheck"]
       interval: 30s
-      timeout: 5s
-      retries: 3
-      start_period: 30s
+      timeout: 30s
+      retries: 5
+      start_period: 180s
     labels:
       - "traefik.enable=true"
       - "traefik.http.routers.uptime-kuma.rule=Host(`${SUBDOMAIN}.${DOMAIN}`)"