Some tricks required here to get the dependencies to work out, but we got it!!
Oh also, we move away from the rbenv in Ubuntu's package manager, because it doesn't support more recent Rubies like 2.4.10.
NOTE: This doesn't boot yet! There's something changed in the `devise` API that we'll need to fix!
```
/vagrant/config/initializers/devise.rb:46:in `block in <top (required)>': undefined method `encryptor=' for Devise:Module (NoMethodError)
```
But yeah, we navigated the gem upgrades, and also I ran `rake rails:update` and hand-processed the suggestions it had for our config files.
These are necessary for installing some of our gems!
Note the tricky bit where we need an older OpenSSL package when building Ruby 1.9.3, but need to uninstall before `libmysqlclient-dev`, which requires a more recent version of `libssl-dev`. I thiiiink this is safe to do, but we'll find out!
The intent is to set up for an upgrade of Ruby and Rails to the modern versions, but I want to start by having a stable running copy that we can incrementally pull up to new versions of things!
And it turns out getting Ruby 1.9.3 to build on modern platforms is hard! I started by trying on macOS and just couldn't get there, the instructions I found for workarounds didn't seem to work anymore.
So the solution I landed on was to set up an Ubuntu VM, and follow some instructions from https://stackoverflow.com/q/51986932 to patch Ruby to work with the version of OpenSSL we have access to!
And it was enough of a challenge that I figured that, rather than setting up the Vagrantfile elsewhere, it would be helpful documentation to do it here, even if we scrap the Vagrantfile etc later once we're in a new stable environment.
