feat: add docker manifests to release notes

[caarlos0]

refs #1923

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[codecov]

Codecov Report

Merging #1925 (43d65a4) into master (3fb2366) will increase coverage by 0.56%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1925      +/-   ##
==========================================
+ Coverage   81.89%   82.46%   +0.56%     
==========================================
  Files          74       74              
  Lines        3933     3940       +7     
==========================================
+ Hits         3221     3249      +28     
+ Misses        583      562      -21     
  Partials      129      129              

Impacted Files	Coverage Δ
internal/artifact/artifact.go	98.05% <100.00%> (+20.83%)	⬆️
internal/pipe/docker/manifest.go	96.49% <100.00%> (+0.26%)	⬆️
internal/pipe/release/body.go	100.00% <100.00%> (ø)

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[github-actions]

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