Create folders for symlink creation

[Hakihiro]

Create parents folders before trying to make symlink for shared/folders

Eg:

 shared: {
            folders: [
                "var/log",
            ]
        },

Ensure that we have var folder, then you can create symlink for log folder to shared/var/log

Can be done for files path too.

To add context : When we deploy a SF application for example we can have var/log path in shared, but we need to gitkeep var to let bipbip able to create the symlink.