Replace imageref in Okteto Registry by their sha to enforce redeploym…

[pchico83]

…ents if the image is updated

We aren't handling imageRef properly in compose files like this:

services:
  web:
    image: okteto.dev/app:okteto
    build: .
    command: ./run_web.sh
    volumes:
      - .:/app
    ports:
      - "8080:8080"

  worker:
    image: okteto.dev/app:okteto
    command: ./run_celery.sh
    volumes:
      - .:/app

because web.image is replaced by its sha256, but worker.image is not.

This PR always translated by its sha256 any compose image reference to the okteto Registry, to enforce redeployment if the image has changed

[codecov]

Codecov Report

Merging #2777 (a9073a5) into master (1c76212) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #2777      +/-   ##
==========================================
- Coverage   32.10%   32.08%   -0.02%     
==========================================
  Files         158      158              
  Lines       18582    18593      +11     
==========================================
  Hits         5966     5966              
- Misses      11910    11921      +11     
  Partials      706      706              

Impacted Files	Coverage Δ
pkg/cmd/stack/deploy.go	20.33% <0.00%> (-0.09%)	⬇️
pkg/registry/client.go	0.00% <0.00%> (ø)
pkg/registry/registry.go	28.57% <0.00%> (-5.12%)	⬇️

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