Identify ourselves to git when changing HOME
Identify ourselves to git when changing HOME

If we change the value of `$HOME`, that means git(1) might not know who
we are. That can lead to warnings like this (taken from CI):

```
*** Please tell me who you are.

Run

  git config --global user.email "you@example.com"
  git config --global user.name "Your Name"

to set your account's default identity.
Omit --global to set the identity only in this repository.

fatal: unable to auto-detect email address (got 'travis@travis-job-da8e5dbd-8be0-4778-931d-583b72258a58.(none)')
```

Let's set our name and email whenever we run commands under a different
home directory, just to be tidy.

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