ci(tags): do not apply 'dev' or 'latest' tags to intermediate container builds (backport #500)

[mergify[bot]]

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Related to #469 Related to #497

Description of the change:

This change allows an environment variable to be configured so that...

Motivation for the change:

This change is helpful because users may want to...

How to manually test:

1. Run CRYOSTAT_IMAGE=quay.io... bash smoketest.bash...
2. ...

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   This is an automatic backport of pull request #500 done by Mergify.