New Script: Prometheus Paperless-NGX Exporter (#2153)

* New Script: Prometheus Paperless NGX Exporter

* Temp: Change import URLs to test fork

* Prometheus Paperless NGX Exporter: Fix double `=`  in systemd unit file

* Revert "Temp: Change import URLs to test fork"

This reverts commit f78d295c02.

* Fix script in `install_methods`

json/prometheus-paperless-ngx-exporter.json

@@ -0,0 +1,43 @@
+{
+    "name": "Prometheus Paperless NGX Exporter",
+    "slug": "prometheus-paperless-ngx-exporter",
+    "categories": [
+        9
+    ],
+    "date_created": "2025-02-07",
+    "type": "ct",
+    "updateable": true,
+    "privileged": false,
+    "interface_port": 3000,
+    "documentation": null,
+    "website": "https://github.com/hansmi/prometheus-paperless-exporter",
+    "logo": "https://raw.githubusercontent.com/paperless-ngx/paperless-ngx/main/resources/logo/web/svg/square.svg",
+    "description": "Prometheus metrics exporter for Paperless-NGX, a document management system transforming physical documents into a searchable online archive. The exporter relies on Paperless' REST API.",
+    "install_methods": [
+        {
+            "type": "default",
+            "script": "ct/prometheus-paperless-ngx-exporter.sh",
+            "resources": {
+                "cpu": 1,
+                "ram": 256,
+                "hdd": 2,
+                "os": "debian",
+                "version": "12"
+            }
+        }
+    ],
+    "default_credentials": {
+        "username": null,
+        "password": null
+    },
+    "notes": [
+        {
+            "text": "Please adjust the Paperless URL in the systemd unit file: /etc/systemd/system/prometheus-paperless-ngx-exporter.service",
+            "type": "info"
+        },
+        {
+            "text": "Please adjust the Paperless authentication token in the configuration file: /etc/prometheus-paperless-ngx-exporter/paperless_auth_token_file",
+            "type": "info"
+        }
+    ]
+}