dev: add docker-in-docker feature to devcontainer

[kenibrewer]

Description

The new hadolint pre-commit hook fails if the user doesn't have docker installed. To ensure our devcontainers continue to work "out of the box" we are adding the docker-in-docker feature to provide the needed executable.

Please also link to any relevant issues that your code is associated with.

What is the nature of your change?

• Bug fix (fixes an issue).
• Enhancement (adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).
• This change requires a documentation update.

Checklist

Please ensure that all boxes are checked before indicating that a pull request is ready for review.

• I have read the CONTRIBUTING.md guidelines.
• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• New and existing unit tests pass locally with my changes.
• I have added tests that prove my fix is effective or that my feature works.
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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.96%. Comparing base (af5a4ef) to head (270f603).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #381   +/-   ##
=======================================
  Coverage   94.96%   94.96%           
=======================================
  Files          56       56           
  Lines        3137     3137           
=======================================
  Hits         2979     2979           
  Misses        158      158           

Flag	Coverage Δ
unittests	94.96% <ø> (ø)

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[d33bs]

Nice update! Apologies about incurring this through recent related changes. LGTM.