Added publishing of major.minor image for the operator

[jpkrohling]

Closes #187
Signed-off-by: Juraci Paixão Kröhling juraci@kroehling.de

[jpkrohling]

This change is 

[codecov]

Codecov Report

Merging #274 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #274   +/-   ##
=======================================
  Coverage   88.94%   88.94%           
=======================================
  Files          68       68           
  Lines        2895     2895           
=======================================
  Hits         2575     2575           
  Misses        211      211           
  Partials      109      109

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[objectiser]

Is it worth doing major version aswell?

[jpkrohling]

We could, although I don't remember seeing it used in practice.

[jpkrohling]

I'll merge this without tagging only the major part. If we get a request for that, we could implement based on the logic from this PR.