docs: add tuxpizza as a contributor for code

[allcontributors]

Adds @tuxpizza as a contributor for code.

This was requested by stavros-k in this comment

[skip ci]

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
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[truecharts-admin]

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