[maintenance] Support arm64

[imnasnainaec]

For maintenance use of aws/kubectl, switch from Docker Hub (amd64 only) to AWS ECR (both amd64 and arm64).

Parallel pr: sillsdev/aws-kubectl#5

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This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.62%. Comparing base (b2e6fb4) to head (03d24a8).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3449      +/-   ##
==========================================
- Coverage   74.63%   74.62%   -0.01%     
==========================================
  Files         285      285              
  Lines       10999    10999              
  Branches     1339     1339              
==========================================
- Hits         8209     8208       -1     
  Misses       2407     2407              
- Partials      383      384       +1     

Flag	Coverage Δ
backend	83.62% <ø> (-0.02%)	⬇️
frontend	66.62% <ø> (ø)

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[jasonleenaylor]

Reviewed 8 of 8 files at r1, 3 of 3 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @imnasnainaec)

[andracc]

Reviewed 3 of 3 files at r3, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @imnasnainaec)