ci: build/push docker images on tag push

[youben11]

Description

• Remove hardcoded image tags used previously (default to latest now)
• Build images on tag push

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I have...

• added a relevant changelog entry to the Unreleased section in CHANGELOG.md
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Code maintenance:

I have...

• written unit and integration tests
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• updated relevant documentation (docs/) or specification (x/<module>/spec/)

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I have...

• confirmed the correct type prefix in the PR title
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• confirmed that this PR does not change production code

[leventdem]

Good idea to trigger both node and dev image on tag release.
+1