Update entrypoint.sh

entrypoint.sh

@@ -3,12 +3,13 @@
 # exit when any command fails
 set -e
 
-# create a tun device
-mkdir -p /dev/net
-mknod /dev/net/tun c 10 200
-chmod 600 /dev/net/tun
+# Check if /dev/net/tun already exists, avoid creating it if it's already present
+if [ ! -c /dev/net/tun ]; then
+    echo "/dev/net/tun not found, unable to create it as non-root user. Ensure the hosting environment provides the tun device."
+    exit 1
+fi
 
-# start dbus
+# start dbus (if applicable)
 mkdir -p /run/dbus
 if [ -f /run/dbus/pid ]; then
     rm /run/dbus/pid