feat(ops/gnobro): introducing Release workflow for the Gnobro tool

[sw360cab]

Adding support for releasing the image of Gnobro

Facilitates #2807

Contributors' checklist...

• [*] Added new tests, or not needed, or not feasible
• [*] Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory
• [*] Updated the official documentation or not needed
• [*] No breaking changes were made, or a BREAKING CHANGE: xxx message was included in the description
• [*] Added references to related issues and PRs
• [*] Provided any useful hints for running manual tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.90%. Comparing base (69400d4) to head (12836f4).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2872   +/-   ##
=======================================
  Coverage   60.90%   60.90%           
=======================================
  Files         564      564           
  Lines       75273    75273           
=======================================
+ Hits        45844    45848    +4     
+ Misses      26057    26054    -3     
+ Partials     3372     3371    -1     

Flag	Coverage Δ
contribs/gnodev	61.46% <ø> (ø)
contribs/gnofaucet	14.46% <ø> (ø)
gno.land	67.17% <ø> (ø)
gnovm	65.77% <ø> (ø)
misc/genstd	80.54% <ø> (ø)
misc/logos	19.88% <ø> (ø)
tm2	62.05% <ø> (-0.02%)	⬇️

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[gfanton]

lgtm! Thanks 🙏!

PS: I've edited the PR title to match convention

[sw360cab]

I keep messing up with the syntax of PR titles 👨‍🚀