Add container templates and installers for apps

Add new ProxmoxVED container templates (ct/*.sh), install scripts (install/*.sh) and metadata (json/*.json) for multiple applications: Akaunting, Blinko, Certimate, Dagu, Gogs, InvoiceShelf, Matomo, Papermark, RSS-Bridge, SolidTime and WhoDB. Each ct script includes update logic and deployment helpers; install scripts handle dependency installation, service creation (systemd), DB setup, and Caddy/PHP/Node/Postgres configuration where applicable. JSON entries provide UI metadata, resource defaults and access ports for each app.

json/papermark.json

@@ -0,0 +1,40 @@
+{
+    "name": "Papermark",
+    "slug": "papermark",
+    "categories": [
+        12
+    ],
+    "date_created": "2026-07-13",
+    "type": "ct",
+    "updateable": true,
+    "privileged": false,
+    "interface_port": 3000,
+    "documentation": "https://www.papermark.com/docs",
+    "website": "https://www.papermark.com/",
+    "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons@main/webp/papermark.webp",
+    "config_path": "/opt/papermark/.env",
+    "description": "Papermark is an open-source document sharing alternative to DocSend with built-in analytics, custom domains, and secure shareable links.",
+    "install_methods": [
+        {
+            "type": "default",
+            "script": "ct/papermark.sh",
+            "resources": {
+                "cpu": 2,
+                "ram": 2048,
+                "hdd": 8,
+                "os": "Debian",
+                "version": "13"
+            }
+        }
+    ],
+    "default_credentials": {
+        "username": null,
+        "password": null
+    },
+    "notes": [
+        {
+            "text": "Requires external blob storage (S3 or compatible) and email service (Resend) configured in .env for full functionality.",
+            "type": "warning"
+        }
+    ]
+}