[Pull First Approach] Build always to global and `okteto.dev`

[jLopezbarb]

[Pull First Approach] Build always to global and `okteto.dev`

[teresaromero]

Regarding the acceptance criteria of this issue i have couple of questions:

Describe the solution you'd like
It should point to the latest image built. In this case the one in step 7. We should be pushing both tags when building with buildkit, to okteto.global/image:hash and okteto.dev/image:okteto. This will ensure that everyone uses the latest images

• When builder is Buildkit
• When image tag is okteto.dev/image:okteto (tagged by user via -t flag, or using the build.image field at the manifest, or leaving this empty so we infer it)
  = We should push both okteto.dev/image:okteto and okteto.global/image:hash to both registries

? the hash is the SHA of the image? or is the hash of aguments?

Additional context
We'll need to change our Build command to support a list of tags instead of a single tag.

I think this should be a separate PR enabling the build option Tag to be []string instead of string

this should happen only with buildkit builds? or all the builds?

[teresaromero]

When image tag is okteto.dev/image:okteto (tagged by user via -t flag, or using the build.image field at the manifest, or leaving this empty so we infer it)

Talked offline:
When we are pushing to global, we should push to dev also