Add sunshine as an optional background service

overlay/etc/cont-init.d/90-configure_sunshine.sh

@@ -0,0 +1,16 @@
+
+echo "**** Configure Sunshine ****"
+
+if ([ "${MODE}" != "s" ] && [ "${MODE}" != "secondary" ]); then
+    if [ "${ENABLE_SUNSHINE:-}" = "true" ]; then
+        echo "Enable Sunshine server"
+        sed -i 's|^autostart.*=.*$|autostart=true|' /etc/supervisor.d/sunshine.ini
+        chmod +x /usr/bin/start-sunshine.sh
+    else
+        echo "Disable Sunshine server"
+    fi
+else
+    echo "Sunshine server not available when container is run in 'secondary' mode"
+fi
+
+echo "DONE"