Allow amazon as a platform

[yachub]

Relates to:

• Add amazon-2023-x86_64 beaker-hostgenerator#333
• Add amazon2023-AARCH64 beaker-hostgenerator#335

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (3ddb181) 74.55% compared to head (d7b7d75) 74.58%.
Report is 1 commits behind head on master.

❗ Current head d7b7d75 differs from pull request most recent head 403a511. Consider uploading reports for the commit 403a511 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1824      +/-   ##
==========================================
+ Coverage   74.55%   74.58%   +0.03%     
==========================================
  Files          81       81              
  Lines        4508     4510       +2     
==========================================
+ Hits         3361     3364       +3     
+ Misses       1147     1146       -1     

Files	Coverage Δ
lib/beaker/host/unix/exec.rb	72.13% <ø> (ø)
lib/beaker/host/unix/file.rb	90.90% <ø> (ø)
lib/beaker/host/unix/pkg.rb	52.38% <100.00%> (ø)
lib/beaker/host_prebuilt_steps.rb	74.03% <100.00%> (+0.59%)	⬆️
lib/beaker/platform.rb	100.00% <100.00%> (ø)
lib/beaker/perf.rb	56.66% <66.66%> (ø)

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[yachub]

@ekohl and @bastelfreak based on the comments, does it seem good for now?