[Docker build] fix defaults with variables in templates #2378
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What changed?
fix for #2362 -
our templating errors when the second arg is empty. so i have to introduce yet another fallback layer to replicate the previous behavior.
internal discussion https://temporaltechnologies.slack.com/archives/C01RN061UMR/p1642085688084200
How did you test it?
tested locally
Potential risks
n/a - all env vars should be specified in a real setup
Is hotfix candidate?
no