ci: fix the docker driver build

[trevorwhitney]

What this PR does / why we need it:

#9247 did not seem to fix the docker driver build. It first failed because of the an incorrect prefix in the job definition, and after that was fixed it failed again because of an undefined env variable.

Depends on grafana/loki-release#165

Which issue(s) this PR fixes:
Fixes #5682, #15318

Checklist

• Reviewed the CONTRIBUTING.md guide (required)
• Documentation added
• Tests updated
• Title matches the required conventional commits format, see here
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