Insure data/alaska.geojson.zip is included in package build

[jhkennedy]

This fixes the first^ build issue seen in conda-forge/raider-feedstock#11 and conda-forge/raider-feedstock#12.

In both of those PRs, the tools/RAiDER/models/data/alaska.geojson.zip file was not included in the built package because we're building from a src tarball, which does not have the .git data inside it that is used by setuptools_scm to ensure all checked-in files are in the distribution (likewise, this is not an issue seen when building from a clone).

You can reproduce the missing zip file like:

wget https://github.com/dbekaert/RAiDER/archive/v0.4.3.tar.gz 
tar -zxvf v0.4.3.tar.gz
export SETUPTOOLS_SCM_PRETEND_VERSION=0.4.3
python -m pip install ./RAiDER-0.4.3 --no-cache-dir

And look at the installed package.

Then, if you make the changes here, you'll see the zip file show up in the installed package.

---

^ Takling the second build issue in a follow-on PR

[jhkennedy]

CircleCI appear to be a Herbie problem and not related to this change, so I'm content to punt that to a follow on issue/pr.

[jlmaurer]

LGTM