add selfupdate version to schema

Signed-off-by: si458 <simonsmith5521@gmail.com>

docs/docs/meshcentral/index.md

@@ -213,7 +213,7 @@ As indicated before, the settings section of the config.json is equivalent to pa
 | RedirPort | This is the port for redirecting traffic in the web server. When the server is configured with HTTPS, users that uses HTTP will be redirected to HTTPS. Port 80 is the default port. So, redirection will happen from port 80 to port 443.  |
 | MpsPort | Port for Intel" AMT Management Presence Server to receive Intel" AMT CIRA (Client Initiated Remote Access) connections. The default is port 4433. This port is disabled in LAN mode. If user don"t plan on using Intel" AMT for management, this port can be left as-is. |
 | TLSOffload | By default this option is set to "false". If set to "true", server will run both web port and the Intel AMT MPS port without TLS with the assumption that a TLS offloading is taking care of this task. For further details, see the "TLS Offloading" section. This option can also be set to the IP address of the reverse-proxy in order to indicate to MeshCental to only trust HTTP X-Forwarded headers coming from this IP address. See the "Reverse-Proxy Setup" section for an example. |
-| SelfUpdate | When set to "true" the server will check for a new version and attempt to self-update automatically a bit after midnight local time every day. For this to work, the server needs to run with sufficient permissions to overwrite its own files. If you run the server with more secure, restricted privileges, this option should not be used. If set to a specific version such as "0.2.7-g" when the server will immediately update to the specified version on startup if it"s not already at this version. |
+| SelfUpdate | When set to "true" the server will check for a new version and attempt to self-update automatically a bit after midnight local time every day. If set to a specific version such as "1.1.21" the server will immediately update to the specified version on startup if it's not already at this version. |
 | SessionKey | This is the encryption key used to secure the user"s login session. It will encrypt the browser cookie. By default, this value is randomly generated each time the server starts. If many servers are used with a load balancer, all servers should use the same session key. In addition, one can set this key so that when the server restarts, users do not need to re-login to the server. |
 | Minify | Default value is 0, when set to 1 the server will serve "minified" web pages, that is, web pages that have all comments, white spaces and other unused characters removed. This reduces the data size of the web pages by about half and reduced the number requests made by the browser. The source code of the web page will not be easily readable, adding "&nominify=1" at the end of the URL will override this option. |
 | User | Specify a username that browsers will be automatically logged in as. Useful to skip the login page and password prompts. Used heavily during development of MeshCentral. |

meshcentral-config-schema.json

@@ -446,9 +446,12 @@
           "description": "By default, a nice looking 404 error page is displayed when needed. Set this to false to disable it."
         },
         "selfUpdate": {
-          "type": "boolean",
+          "type": [
+            "string",
+            "boolean"
+          ],
           "default": false,
-          "description": "When true, this server will attempt to self-update everyday after midnight."
+          "description": "When set to true, the server will check for a new version and attempt to self-update automatically a bit after midnight local time every day. If set to a specific version such as \"1.1.21\" the server will immediately update to the specified version on startup if it's not already at this version."
         },
         "cleanNpmCacheOnUpdate": {
           "type": "boolean",