Allow shared directory to be a symlink

[vlfesko]

Add follow=True to shared directory check to allow shared to be a symlink

[ricardclau]

I think this would break BC in some scenarios... what is the use case for this?

Moreover, this also breaks Ansible < 1.8 for everybody, so generally speaking 👎 unless there is a very good reason to add this extra flag

[vlfesko]

Hi, in my case all 'shared' resources are stored on HDD, as long as project sources and system itself is stored on SSD drive. That's why 'shared' directory is actually symlink.
Nevertheless there are many other workarounds how to setup project to not have 'shared' as a symlink, so never mind. But please consider this option for feature, it is useful in some scenarios. Thx!

[ricardclau]

As I mentioned in other PRs and issues, shared links will possibly be refactored in a future Ansistrano 2.0 branch but we don´t want to break compatibility for now

Thanks for sharing your case as I guess it is relatively common