healthchecks (#7177)

* 'Add new script'

* add missing source

* Update documentation URL in healthchecks.

* Update source URL in healthchecks-install.sh

* Update healthchecks.json with additional notes

---------

Co-authored-by: push-app-to-main[bot] <203845782+push-app-to-main[bot]@users.noreply.github.com>
Co-authored-by: CanbiZ <47820557+MickLesk@users.noreply.github.com>

frontend/public/json/healthchecks.json

@@ -0,0 +1,44 @@
+{
+  "name": "Healthchecks",
+  "slug": "healthchecks",
+  "categories": [
+    9
+  ],
+  "date_created": "2025-08-25",
+  "type": "ct",
+  "updateable": true,
+  "privileged": false,
+  "config_path": "/opt/healthchecks/hc/local_settings.py",
+  "interface_port": 3000,
+  "documentation": "https://healthchecks.io/docs/",
+  "website": "https://healthchecks.io/",
+  "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons/webp/healthchecks.webp",
+  "description": "Healthchecks is a cron job monitoring service. It listens for HTTP requests and email messages (\"pings\") from your cron jobs and scheduled tasks (\"checks\"). When a ping does not arrive on time, Healthchecks sends out alerts. Healthchecks comes with a web dashboard, API, 25+ integrations for delivering notifications, monthly email reports, WebAuthn 2FA support, team management features: projects, team members, read-only access.",
+  "install_methods": [
+    {
+      "type": "default",
+      "script": "ct/healthchecks.sh",
+      "resources": {
+        "cpu": 2,
+        "ram": 2048,
+        "hdd": 5,
+        "os": "Debian",
+        "version": "12"
+      }
+    }
+  ],
+  "default_credentials": {
+    "username": null,
+    "password": null
+  },
+  "notes": [
+    {
+      "text": "if you change your LXC-IP, you need to update /etc/caddy/Caddyfile & /opt/healthchecks/hc/local_settings.py",
+      "type": "info"
+    },
+    {
+      "text": "Show credentials: `cat ~/healthchecks.creds`",
+      "type": "info"
+    }
+  ]
+}