chore: Make test container builder methods private

[spencewenski]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 40.69%. Comparing base (4825937) to head (1ade0f7).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/app/context.rs	0.00%	2 Missing ⚠️

Files with missing lines	Coverage Δ
src/app/context.rs	13.63% <0.00%> (ø)

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