feat: expose appStartPath on cap config server configuration (#8019)

Co-authored-by: Mark Anderson <mark.anderson@outsystems.com>

Author: benmccarty91

android/capacitor/src/main/java/com/getcapacitor/CapConfig.java

@@ -251,6 +251,7 @@ private void deserializeConfig(@Nullable Context context) {
         serverUrl = JSONUtils.getString(configJSON, "server.url", null);
         hostname = JSONUtils.getString(configJSON, "server.hostname", hostname);
         errorPath = JSONUtils.getString(configJSON, "server.errorPath", null);
+        startPath = JSONUtils.getString(configJSON, "server.appStartPath", null);
 
         String configSchema = JSONUtils.getString(configJSON, "server.androidScheme", androidScheme);
         if (this.validateScheme(configSchema)) {

cli/src/declarations.ts

@@ -610,6 +610,15 @@ export interface CapacitorConfig {
      * @default null
      */
     errorPath?: string;
+
+    /**
+     * Append a path to the app URL.
+     *
+     * Allows loading from other paths than the default `/index.html`.
+     * @since 7.3.0
+     * @default null
+     */
+    appStartPath?: string;
   };
 
   cordova?: {

ios/Capacitor/Capacitor/CAPInstanceDescriptor.swift

@@ -149,6 +149,9 @@ internal extension InstanceDescriptor {
             if let initialFocus = (config[keyPath: "ios.initialFocus"] as? Bool) ?? (config[keyPath: "initialFocus"] as? Bool) {
                 hasInitialFocus = initialFocus
             }
+            if let startPath = (config[keyPath: "server.appStartPath"] as? String) {
+                appStartPath = startPath
+            }
         }
     }
     // swiftlint:enable cyclomatic_complexity