Wait for lnd and stagger startup time for lndk

[mrfelton]

This pull request mainly focuses on enhancing the startup process of the lnd nodes in a Docker environment. The changes include the addition of a REST listener in the lnd configuration, the implementation of startup delay scripts for the lndk nodes that waits for the lnd nodes to become fully ready before starting lndk, and the modification of the docker-compose.yml file to incorporate these scripts into the startup process of the nodes.

Configuration changes:

• conf/lnd/lnd.conf: Added a REST listener at 0.0.0.0:8080 to the lnd configuration.

Startup delay scripts:

• docker/lndk/wait-for-lnd.sh: Added a script to delay the startup of lndk nodes until lnd's gRPC port is ready. The script checks the status of lnd using a curl command and starts the lndk nodes with the provided arguments after a specified delay once lnd is ready.

Docker Compose changes:

• docker-compose.yml: Modified the entrypoint for the services to use the newly added startup delay scripts. Also added the scripts to the volumes of the services. [1] [2]