MVP(v0.1.0)

[ethanholz]

This PR aims to provide the minimum needed for building out this GitHub Action for use. There are a couple issues that will need to be closed/created following this PR:

• [x] #7
• [ ] Add support for non-x86_64 Linux runners
• [ ] Create a way to test the current state of the runner via an integration test in the repo itself
• [ ] Publish the Docker container to GHCR for faster start times

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 96.36364% with 4 lines in your changes missing coverage. Please review.

Project coverage is 95.74%. Comparing base (970c23e) to head (864e1fd).

Files	Patch %	Lines
src/gha_runner/__main__.py	94.44%	4 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #8 +/- ## =========================================== + Coverage 78.41% 95.74% +17.33% =========================================== Files 3 3 Lines 227 282 +55 =========================================== + Hits 178 270 +92 + Misses 49 12 -37 ``` | [Flag](https://app.codecov.io/gh/omsf-eco-infra/gha-runner/pull/8/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/8/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=omsf-eco-infra) | `95.74% <96.36%> (+17.33%)` | :arrow_up: | 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]

I would like to note that the failure on codecov is not necessarily representative of the changes made as the testable, non-infra provisioning code is tested __main__.py and is an increase from before.

[ethanholz]

@dwhswenson I believe that I have updated the docs/README to better reflect usage. Do these changes make sense?