Bugfix: Travis is still the one releasing to production

[sanderegg]

What do these changes do?

bugfix:

• prevents github action from pushing :latest images.

Related issue number

How to test

Checklist

• Did you change any service's API? Then make sure to bundle document and upgrade version (make openapi-specs, git commit ... and then make version-*)
• Unit tests for the changes exist
• Runs in the swarm
• Documentation reflects the changes
• New module? Add your github username to .github/CODEOWNERS

[codecov]

Codecov Report

Merging #1351 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1351      +/-   ##
==========================================
- Coverage   72.73%   72.72%   -0.02%     
==========================================
  Files         201      201              
  Lines        8358     8358              
  Branches      939      939              
==========================================
- Hits         6079     6078       -1     
- Misses       2005     2006       +1     
  Partials      274      274

Flag	Coverage Δ
#integrationtests	57.82% <ø> (ø)	⬆️
#unittests	67.04% <ø> (-0.02%)	⬇️

Impacted Files	Coverage Δ
.../director/src/simcore_service_director/producer.py	66.75% <0%> (-0.26%)	⬇️

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[mguidon]

Go for it

[pcrespov]

It would also be good to make sure that images with the same tags are not overwritten. There are some scripts with that idea in our ITISFOujdation/Dockerfile repo!