added note regarding "host.docker.internal"

entrypoint.sh

@@ -1,6 +1,8 @@
 #!/bin/sh
 set -e
 
+# potential alternative: host.docker.internal
+# docker v20.10.0 vhttps://github.com/moby/moby/pull/40007
 export DOCKER_HOST_ADDRESS="$(ip route show default | grep default | cut -d ' ' -f 3)"
 
 set -x