Add Prometheus-Blackbox-Exporter script (#956)

* prometheus-blackbox-exporter

container maker for prometheus-blackbox-exporter

* Update prometheus-blackbox-exporter.sh builder source

Modifyed the builder to:
https://raw.githubusercontent.com/community-scripts/ProxmoxVED/main

* prometheus-blackbox-exporter header

prometheus-blackbox-exporter header artwork

* add prometheus-blackbox-exporter-install

adding the prometheus blackbox exporter installer

* Adding prometheus-blackbox-exporter.json

adding the front end page for prometheus blackbox exporter

* Update ct/prometheus-blackbox-exporter.sh

Simplify the code using apt update.

Co-authored-by: Michel Roegl-Brunner <73236783+michelroegl-brunner@users.noreply.github.com>

* Update install/prometheus-blackbox-exporter-install.sh

Format the code.

Co-authored-by: Michel Roegl-Brunner <73236783+michelroegl-brunner@users.noreply.github.com>

* Update prometheus-blackbox-exporter.json

Updated the logo resource to use selfh

* Update prometheus-blackbox-exporter-install.sh

Optimized the code:
*double enable has been reduced
*systemctl daemon-reload removed not needed.

* Update prometheus-blackbox-exporter.sh

Removed all comments

* Update prometheus-blackbox-exporter-install.sh

Removed all comments

* Delete ct/headers/prometheus-blackbox-exporter.txt

Removed the header file.

* Update prometheus-blackbox-exporter-install.sh

* Update prometheus-blackbox-exporter.json

* Update prometheus-blackbox-exporter.sh

* Update prometheus-blackbox-exporter.sh

---------

Co-authored-by: Michel Roegl-Brunner <73236783+michelroegl-brunner@users.noreply.github.com>
Co-authored-by: Slaviša Arežina <58952836+tremor021@users.noreply.github.com>

frontend/public/json/prometheus-blackbox-exporter.json

@@ -0,0 +1,41 @@
+{
+  "name": "Prometheus Blackbox Exporter",
+  "slug": "prometheus-blackbox-exporter",
+  "categories": [
+    1,
+    9
+  ],
+  "date_created": "2025-09-29",
+  "type": "ct",
+  "updateable": true,
+  "privileged": false,
+  "interface_port": 9115,
+  "documentation": "https://github.com/prometheus/blackbox_exporter",
+  "website": "https://github.com/prometheus/blackbox_exporter",
+  "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons/webp/prometheus.webp",
+  "config_path": "/opt/blackbox-exporter/blackbox.yml",
+  "description": "An exporter allows blackbox probing of endpoints over HTTP, HTTPS, DNS, TCP, ICMP and gRPC for use by the Prometheus monitoring system.",
+  "install_methods": [
+    {
+      "type": "default",
+      "script": "ct/prometheus-blackbox-exporter.sh",
+      "resources": {
+        "cpu": 1,
+        "ram": 512,
+        "hdd": 4,
+        "os": "debian",
+        "version": "13"
+      }
+    }
+  ],
+  "default_credentials": {
+    "username": null,
+    "password": null
+  },
+  "notes": [
+    {
+      "text": "Please adjust the Proxmox credentials in the configuration file!",
+      "type": "info"
+    }
+  ]
+}