Avoid conflict with the VERSION build arg

[guicassolato]

Use a different name for the VERSION build arg in the Dockerfile, to avoid conflict with env vars set at the base image.

❯ docker run --rm -ti registry.access.redhat.com/ubi9/go-toolset:1.21 /bin/bash
bash-5.1$ echo ${VERSION}
1.21.13

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.78%. Comparing base (b9f6460) to head (98e962a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #217   +/-   ##
=======================================
  Coverage   61.78%   61.78%           
=======================================
  Files           2        2           
  Lines         785      785           
=======================================
  Hits          485      485           
  Misses        249      249           
  Partials       51       51           

Flag	Coverage Δ
unit	61.78% <ø> (ø)

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