fix: Create tesseract user and group

[xalelax]

Relevant issue or PR

In #367 , some errors are happening because a module (MLFlow) cannot find the user's home directory. Just setting USER 1000:1000 in the Dockerfile results in weird behaviour in general

Description of changes

Added a groupadd and useradd for tesseract:tesseract in the dockerfile.

Testing done

Locally works as expected on helloworld

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.33%. Comparing base (4ff114f) to head (521bca1).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #369   +/-   ##
=======================================
  Coverage   76.33%   76.33%           
=======================================
  Files          29       29           
  Lines        3343     3343           
  Branches      525      525           
=======================================
  Hits         2552     2552           
  Misses        558      558           
  Partials      233      233           

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[apaleyes]

it's very surprising this used to work before at all. thanks!