[Feature] Enable Albyhub to use phoenixd as a backend

[tlindi]

Description

PR includes tasks for Albyhub use with phoenixd wallet as a its backend.

Closes: #949

• albyhub service is needed to support phoenixd settings (in addition to Default LND)
• Settings switch to Albyhub infopage to change from default LND backend to phoenixd
• During switch albyhub data folder must be reset
• Restart Albyhub service

Code needs to check if phoenixd is installed and working, and its config available.
User needs to take care of Albyhub backups and restore if such needed.

Checklist

• tested successfully on local MyNode, if yes, list the device(s) below
• mentioned related open issue, if any

List of test device(s)

• Raspi4B8GB+ArgonOne+NVMe

[tehelsper]

A better way to handle this might be to create an env file for docker and then remove all the --env lines that need to be different. That way we don't need a script embedded in the service file. Then, do the same logic and setup the env file in pre_albyhub.sh.

https://docs.docker.com/compose/how-tos/environment-variables/set-environment-variables/

[tlindi]

better way to handle this might be to create an env file for docker

Yes, way better, I agree 100%. I'll make it use env file and pre_albyhub.sh.