fix: Don't call EC2 Metadata and allow anonymouse if no cred

[Xuanwo]

Fix #1799

[sylvestre]

Could you please add some comments to explain the why ? :)

[Xuanwo]

Could you please add some comments to explain the why ? :)

DONE.

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +0.04 🎉

Comparison is base (af6e381) 29.39% compared to head (1f6590d) 29.43%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1800      +/-   ##
==========================================
+ Coverage   29.39%   29.43%   +0.04%     
==========================================
  Files          49       49              
  Lines       17713    17715       +2     
  Branches     8547     8539       -8     
==========================================
+ Hits         5206     5215       +9     
+ Misses       7348     7346       -2     
+ Partials     5159     5154       -5     

Impacted Files	Coverage Δ
src/cache/s3.rs	53.44% <0.00%> (-1.91%)	⬇️

... and 12 files with indirect coverage changes

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[Xuanwo]

cc @sylvestre, Please take another look, and release a new version for this fix. Thanks!