Ensure hadolint is included with this repo

[bachya]

Describe what the PR does:

I don't like that #799 requires Docker. Let's go back to what we had.

Does this fix a specific issue?

N/A

Checklist:

• Confirm that one or more new tests are written for the new functionality.
• Run tests and ensure everything passes (with 100% test coverage).
• Update README.md with any new documentation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9e110ba) 100.00% compared to head (c11e494) 100.00%.

❗ Current head c11e494 differs from pull request most recent head b6ea04b. Consider uploading reports for the commit b6ea04b to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##               dev      #800   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           31        31           
  Lines         1759      1759           
=========================================
  Hits          1759      1759           

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