fix: Add default BUILDPLATFORM argument in Dockerfile

[austinc3030]

Summary

This PR adds a default value for the BUILDPLATFORM build argument in the Dockerfile to prevent build failures when the platform is not explicitly specified.

Changes

• Added ARG BUILDPLATFORM=linux/amd64 before the FROM instruction to provide a sensible default

Why This Fix is Needed

The Dockerfile uses --platform=${BUILDPLATFORM} in the FROM instruction for cross-compilation, but the BUILDPLATFORM argument was not defined with a default value. This causes build failures in environments where the build platform is not automatically set.

By providing a default value of linux/amd64, the Dockerfile will build successfully even when BUILDPLATFORM is not explicitly passed as a build argument, while still allowing it to be overridden when needed.

Testing

• Verified the Dockerfile builds successfully without specifying --build-arg BUILDPLATFORM
• Confirmed the existing build behavior is preserved when BUILDPLATFORM is explicitly provided

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.99%. Comparing base (61655d4) to head (18d7589).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1070   +/-   ##
=======================================
  Coverage   94.99%   94.99%           
=======================================
  Files          61       61           
  Lines        3397     3397           
=======================================
  Hits         3227     3227           
  Misses        158      158           
  Partials       12       12           

Flag	Coverage Δ
unittests	94.99% <ø> (ø)

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