test(config): Add tests on configuration loading

[corrieriluca]

Tested:

• Configuration loaded with YAML
• Configuration overloaded with environment

Missing:

• Test overrides with CLI flags

[codecov-commenter]

Codecov Report

Merging #144 (82f8ae6) into main (96c0c2a) will increase coverage by 0.46%. The diff coverage is 50.00%.

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@@            Coverage Diff             @@
##             main     #144      +/-   ##
==========================================
+ Coverage   52.16%   52.63%   +0.46%     
==========================================
  Files          23       24       +1     
  Lines        1549     1615      +66     
==========================================
+ Hits          808      850      +42     
- Misses        700      722      +22     
- Partials       41       43       +2     

Impacted Files	Coverage Δ
internal/controllers/manager.go	6.06% <0.00%> (ø)
internal/burrito/config/config.go	63.63% <100.00%> (ø)

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