WSLGd: load user weston.ini

Allow user to customize weston settings (e.g to load xkb keymaps that
don't have a Windows counterpart).
Load ".weston.ini" from User Profile dir if it exists.

WSLGd/main.cpp

@@ -12,6 +12,7 @@
 #define WESTON_NOTIFY_SOCKET SHARE_PATH "/weston-notify.sock"
 #define DEFAULT_ICON_PATH "/usr/share/icons"
 #define USER_DISTRO_ICON_PATH USER_DISTRO_MOUNT_PATH DEFAULT_ICON_PATH
+#define USER_WESTON_CONFIG_FILE ".weston.ini"
 
 constexpr auto c_serviceIdTemplate = "%08X-FACB-11E6-BD58-64006A7986D3";
 constexpr auto c_userName = "wslg";
@@ -444,6 +445,21 @@ try {
     westonArgs += " ";
     westonArgs += westonLoggerOption;
 
+    // Check whether a user weston.ini exists and add it to weston options
+    std::string westonConfigOption("--config=");
+    std::string westonConfigFilePath;
+    auto userProfile = getenv(c_userProfileEnv);
+    if (userProfile) {
+        westonConfigFilePath = TranslateWindowsPath(userProfile);
+        westonConfigFilePath += "/" USER_WESTON_CONFIG_FILE;
+    }
+
+    if (std::filesystem::is_regular_file(westonConfigFilePath)) {
+        westonConfigOption += westonConfigFilePath;
+        westonArgs += " ";
+        westonArgs += westonConfigOption;
+    }
+
     // Launch weston.
     // N.B. Additional capabilities are needed to setns to the mount namespace of the user distro.
     monitor.LaunchProcess(std::vector<std::string>{