feat(transprot): add flag for avif

[ykzts]

Resolve #439

[vercel]

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[codecov]

Codecov Report

Merging #441 (b8563f3) into main (c600bdb) will increase coverage by 0.18%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main     #441      +/-   ##
==========================================
+ Coverage   75.18%   75.37%   +0.18%     
==========================================
  Files           6        6              
  Lines         133      134       +1     
==========================================
+ Hits          100      101       +1     
  Misses         23       23              
  Partials       10       10              

Impacted Files	Coverage Δ
transport.go	77.27% <50.00%> (+0.34%)	⬆️

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