Add LXD example for custom executor

What does this MR do?

Add example on how to set up lxc executor using the Custom executor

Why was this MR needed?

To give a concrete example to the user.

Does this MR meet the acceptance criteria?

  • Documentation created/updated
  • Added tests for this feature/bug
  • In case of conflicts with master - branch was rebased

What are the relevant issue numbers?

Part of #4257 (closed)

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