Automate VAAPI and NVIDIA setup inside LXC containers

Added direct installation of VAAPI and NVIDIA drivers inside LXC containers during setup, removing reliance on custom in-container scripts. The process now ensures required packages are installed and user permissions are set, improving automation and compatibility for supported distributions.

misc/build.func

@@ -2276,6 +2276,9 @@ EOF
   fi
 
   msg_info "Customizing LXC Container"
+  # Container erfolgreich gestartet
+  vaapi_inside_setup "$CTID" "$CT_TYPE"
+  nvidia_inside_setup "$CTID" "$CT_TYPE"
   if [ "$var_os" == "alpine" ]; then
     sleep 3
     pct exec "$CTID" -- /bin/sh -c 'cat <<EOF >/etc/apk/repositories