feat(s3): add server side encryption

[nebnes]

Add server side encryption with s3

via env
SCCACHE_S3_SERVER_SIDE_ENCRYPTION=true

[codecov-commenter]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (841fb0b) 29.76% compared to head (69a1dbe) 29.69%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1908      +/-   ##
==========================================
- Coverage   29.76%   29.69%   -0.07%     
==========================================
  Files          50       50              
  Lines       18014    18018       +4     
  Branches     8697     8705       +8     
==========================================
- Hits         5362     5351      -11     
+ Misses       7490     7488       -2     
- Partials     5162     5179      +17     

Files	Coverage Δ
src/cache/cache.rs	38.74% <0.00%> (+0.22%)	⬆️
src/cache/s3.rs	52.54% <0.00%> (-1.85%)	⬇️
src/config.rs	29.61% <18.18%> (+0.08%)	⬆️

... and 8 files with indirect coverage changes

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[sylvestre]

please run rustfmt :)

[sylvestre]

@Xuanwo what do you think about this ? :)
it looks good to me