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

[andrewazores]

Welcome to Cryostat3! 👋

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• [x] Read the contributing guidelines
• [x] Linked a relevant issue which this PR resolves
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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. ...

[andrewazores]

@Mergifyio backport cryostat-v3.0

[mergify[bot]]

backport cryostat-v3.0

✅ Backports have been created

* [#501 ci(tags): do not apply 'dev' or 'latest' tags to intermediate container builds (backport #500)](https://github.com/cryostatio/cryostat3/pull/501) has been created for branch `cryostat-v3.0`