github: add non-ghcr tags for dockerhub

[corverroos]

Fixes issue that dockerhub images are not pushed. Adds non-ghcr image prefix so dockerhub compatible tags are also produced. See https://github.com/docker/metadata-action#images-input for example.

category: misc
ticket: #781

[codecov]

Codecov Report

Merging #812 (fbc1c47) into main (588181d) will decrease coverage by 0.44%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #812      +/-   ##
==========================================
- Coverage   54.87%   54.42%   -0.45%     
==========================================
  Files         109      109              
  Lines       10772    10772              
==========================================
- Hits         5911     5863      -48     
- Misses       3997     4044      +47     
- Partials      864      865       +1     

Impacted Files	Coverage Δ
core/qbft/qbft.go	71.67% <0.00%> (-10.31%)	⬇️

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