VVV: Broken Key Forwarding and GitHub host verification failure

In order to add the custom site, I read I just need set repo https://github.com/Varying-Vagrant-Vagrants/vvv-wordpress-default.git with provision for a default WordPress website.

Now, I just want to customize the provision, adding other actions specific for my work (such install plugins, themes, XML data, so on). So, I made my own private repository where I did the thing I need and everything could be all fine, except for the fact that I have an error when the provisioner tries to clone a private repository because he cannot authenticate. Unfortunately, I need that this would be in a private repository and not a public one.

Expected Behavior

I expect me one of these things:

• ask me the username or password in order to make the authentication
• give me the ssh key of vagrant and ask me to add into my Github/Bitbucket account
• use the private key of my local host (and not vagrant one) that should be already added in my Github/Bitbucket account

Current Behavior

This is the error if I try to write the git URL for ssh connection (that is git@github.com:ecc/ecc.git)

==> default: Host key verification failed.
==> default: fatal: Could not read from remote repository.

Instead, this is the error if I put the https URL for git repository:

==> default: fatal: could not read Username for 'https://github.com': No such device or address

Possible Solution

Try to connect ssh with the private key of the local host machine, not vagrant one, I don’t know if it’s possible and how to do that.

Steps to Reproduce (for bugs)

1. Clone https://github.com/Varying-Vagrant-Vagrants/vvv-wordpress-default.git into a private repository
2. Add new custom site into vvv-config.yml from the private repository
3. Make vagrant provision

Your Environment

• VVV version: 2.0.0
• Vagrant version: 1.9.0
• VM Provider name: VirtualBox
• VM Provider version: 5.1.22
• Operating System and version: MacOS 10.12.5