fix: explicit alpine version, so dependabot detects it #2061
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What is the problem I am trying to address?
Dependabot does not detect docker image version/tag, if we use a variable.
How is the fix applied?
Explicitly set the tag/version of the Alpine image, then Dependabot detects it and creates PRs.
Tested with dependabot locally:
dependabot update docker drpsychick/athens --local ./ -d /cmd/proxy
What GitHub issue(s) does this PR fix or close?
Fixes #2055 (previous attempt #2060)