shared-directory should only be created if needed

[alexgit2k]

The task deploy:setup creates the directories .dep, releases and shared if they do not exist: https://github.com/deployphp/deployer/blob/c36566145a8c17fda3feecbc802e6fb9e7edaa59/recipe/deploy/setup.php#L9-L11

If shared_dirs and shared_files are not set the shared is not needed and should therefore be not created.

The task deploy:shared uses -p for --parents for creating directories, which would also create parent directories like the shared-directory: https://github.com/deployphp/deployer/blob/c36566145a8c17fda3feecbc802e6fb9e7edaa59/recipe/deploy/shared.php#L43 So line 11 in recipe/deploy/setup.php is not needed: https://github.com/deployphp/deployer/blob/c36566145a8c17fda3feecbc802e6fb9e7edaa59/recipe/deploy/setup.php#L11

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