Allow deployment of Git working copy for Provision development

I discussed this with ergonlogic. Looks like there's no way to get a git clone for Provision.

I tried the following as per his recommendations, requiring the makefile:

1. sudo apt install debconf-utils
2. mkdir -p ~/projects/aegir/core
3. git clone https://git.drupal.org/project/hostmaster.git
4. echo "aegir3-hostmaster aegir/makefile string /home/$USER/projects/aegir/core/hostmaster/hostmaster.make" | sudo debconf-set-selections
5. echo "aegir3-hostmaster aegir/working-copy boolean true" | sudo debconf-set-selections

This leads to the following, breaking the installation:

Do you really want to proceed with the install (y/n): y
 [success] 'drush' cache was cleared.
Enabling hosting-queued daemon
 [error]  Could not find the alias @hostmaster 
dpkg: error processing package aegir3-hostmaster (--configure):
 subprocess installed post-installation script returned error exit status 1

This makefile appears to break things.

13:14 < ergonlog1c> try passing the aegir.dev makefile in provision
13:15 < ergonlog1c> http://cgit.drupalcode.org/provision/plain/aegir-dev.make

So the following, as suggested above, seemed to work, but as expected, only for the front-end:

1. sudo apt install debconf-utils
2. mkdir -p ~/projects/aegir/core
3. git clone https://git.drupal.org/project/hostmaster.git ~/projects/aegir/core/hostmaster
4. git clone https://git.drupal.org/project/provision.git ~/projects/aegir/core/provision
5. echo "aegir3-hostmaster aegir/makefile string /home/$USER/projects/aegir/core/provision/aegir-dev.make" | sudo debconf-set-selections
6. echo "aegir3-hostmaster aegir/working-copy boolean true" | sudo debconf-set-selections
7. sudo apt install aegir3

Would it be possible to enable a similar set-up for the back-end so that Provision can also be deployed as a Git clone in /usr/share/drush/commands/provision?

I updated the documentation to reflect all of this.