add changelog for v0.8.0

[cpanato]

Summary

• add changelog for v0.8.0

Ticket Link

n/a

Release Note

NONE

[codecov-commenter]

Codecov Report

Merging #866 (ab2d69c) into main (08d04c0) will increase coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #866      +/-   ##
==========================================
+ Coverage   46.24%   46.34%   +0.09%     
==========================================
  Files          60       60              
  Lines        5138     5138              
==========================================
+ Hits         2376     2381       +5     
+ Misses       2487     2483       -4     
+ Partials      275      274       -1     

Impacted Files	Coverage Δ
pkg/types/tuf/v0.0.1/entry.go	41.70% <0.00%> (+0.80%)	⬆️
pkg/types/alpine/v0.0.1/entry.go	55.78% <0.00%> (+1.23%)	⬆️

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