test: Moves openmm-gpu-test into this repo

[ethanholz]

Moves and (slightly) modifies the code from omsf-eco-infra/openmm-gpu-test into this repo. I have added the IAM role as a secret so it is easier to do testing in the future and it is already added to the repo.

[ethanholz]

Closes #34

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.73%. Comparing base (795fe0c) to head (6a8657a). Report is 3 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #35 +/- ## ======================================= Coverage 94.73% 94.73% ======================================= Files 3 3 Lines 304 304 ======================================= Hits 288 288 Misses 16 16 ``` | [Flag](https://app.codecov.io/gh/omsf-eco-infra/gha-runner/pull/35/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=omsf-eco-infra) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/omsf-eco-infra/gha-runner/pull/35/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=omsf-eco-infra) | `94.73% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=omsf-eco-infra#carryforward-flags-in-the-pull-request-comment) to find out more.

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[ethanholz]

@dwhswenson this is ready for review and has all the pieces in place for running multiple tests!

[ethanholz]

One thing to note, our previous PR #24, had the initial staging for CI docs (specifically a test plan). We may want to consider splitting docs for CI into its own PR that is separate from that PR.