peter279k commented on PR #10463:
URL: https://github.com/apache/nifi/pull/10463#issuecomment-3459517442
For example, these lines about declaring an argument should be existed at
the same time.
```bash
ARG MIRROR_BASE_URL
ARG MIRROR_BASE_URL=${MIRROR_BASE_URL:-${BASE_URL}}
```
The first line is used to initial this argument, and the second line is used
to assign the value to this argument.
Once we don't have the first line, it will present the `UndefinedVar`
warning message when building the NiFi Docker image.
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