chore(plex): add valid_chars and docs (#3399)

* chore(plex): add valid_chars and docs

* adapt to new questions template

charts/stable/plex/docs/validation.md

@@ -0,0 +1,16 @@
+# Input Validation
+
+**`Advertise IP`**
+Accepted formats are:
+
+- `https://192.168.1.100:32400`
+- `https://192.168.1.100:32400`
+- `http://dnsname:32400`
+- `https://dnsname:32400`
+
+Regex used to match this: `^http(s)?:\/\/.*:\d*$`
+You can try live [here](https://regex101.com/r/3ehGWY/1)
+
+---
+
+_If you find a field that you think it needs validation, please open an issue on github_

charts/stable/plex/questions.yaml

@@ -21,10 +21,11 @@ questions:
       attrs:
         - variable: ADVERTISE_IP
           label: "Advertise IP"
-          description: "IP to advertise to Plex"
+          description: "IP to advertise to Plex, Change SERVER_IP to your actual server IP"
           schema:
             type: string
-            default: ""
+            valid_chars: '^http(s)?:\/\/.*:\d*$'
+            default: "http://SERVER_IP:32400"
         - variable: ALLOWED_NETWORKS
           label: "Allowed Networks"
           description: "Networks allowed to connect to plex. Add your local network IP to this list"