VVV specific dockerfile, gets built on provision

[tomjn]

Moves the dockerfile from pentatonic funk over to VVV, this does centralise things here, though ideally we build this and put it up as an image with a VVV name. I also used [email protected] but that's only slightly less problematic ( is it optional? ).

The other Q is, what can we put in here to save time during the main VVV provisioner that only docker can do? Do we need a compose file to setup Nginx/MariaDB containers and would that mean changing other parts of VVV to make that work? Would all wp-config.php files need to change on docker based setups?

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[update-docs]

Thanks for opening this pull request! Make sure CHANGELOG.md gets updated with this change, additionally any docs that need updated can be found at https://github.com/Varying-Vagrant-Vagrants/varyingvagrantvagrants.org

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[tomjn]

I'm thinking this could be expanded to execute the main provisioner, and perhaps some of the tools provisioner ( parts that don't use shared/mapped folders at runtime ). Then this could be set on a toggle/switch as a way to build a VVV container for a stable version