[package] Error packaging Docker image with single-jar distribution

[jruaux]

With a single-jar distribution the following error occurs in the Docker image build:
can't create directory '/myapp/': Not a directory

This seems to be caused by a clash between target assembly subdirectory and executable names. Both default to {{distributionName}}) in the Dockerfile template so mkdir fails:

COPY assembly/ /

RUN mkdir -p /{{distributionName}}/bin && \

Workaround is simple enough (set executable name for the distribution) but it would be nice to have it work with defaults.

[aalmiray]

Released in v1.3.0 -> https://github.com/jreleaser/jreleaser/releases/tag/v1.3.0