chore(docker): Declare linux/amd64 platform during build

[effigies]

Closes #3397.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.33%. Comparing base (08a5126) to head (c4fd4b9).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3422   +/-   ##
=======================================
  Coverage   72.33%   72.33%           
=======================================
  Files          57       57           
  Lines        4269     4269           
  Branches      545      545           
=======================================
  Hits         3088     3088           
  Misses       1065     1065           
  Partials      116      116           

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