Adjust tags in image-push GHA

[avasilevskii]

Preparation step for #8.
Change of image push behavior and tags:

• Build images on main branch merges and push them with latests tag.
• Build images on GH release and push them with stable and release tag.

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[kpouget]

can we use a short sha? (7-8 first chars)

[kpouget]

lgtm, just a minor comment related to the tag name size
(I'm not sure if ${{ github.sha }} is the full SHA, 41 chars. If yes we can truncate it)