Use symlinks with ddev service enable?

[deviantintegral]

One challenge with ddev services is that if a developers enables a service on their local, the service definition is copied. If the service configuration is changed, you have to manually remind any users to disable and re-enable the service to get the changes.

Is there any reason why ddev service enable doesn't use symlinks? I think switching that would be seen as a breaking change, but perhaps we could do ddev service enable --link ...? Though in practice I think I'm just going to recommend our team run ln -s ... to do it.

[rfay]

Seems like a good idea to me. Related:

• Add ddev get --installed to show what's installed as add-ons #3555

Also a near-term plan to do several other things in that area, https://github.com/drud/ddev/issues?q=is%3Aissue+is%3Aopen+label%3A%22addon+mechanism%22