Docker image fails to build

[jinnatar]

[*snip*]
Step 7/9 : RUN poetry install
 ---> Running in 152d259ac155
Skipping virtualenv creation, as specified in config file.
Installing dependencies from lock file

Because borg-exporter depends on pytest-celery (^0.0.0-alpha.1) which doesn't match any versions, version solving failed.
The command '/bin/sh -c poetry install' returned a non-zero code: 1

[jinnatar]

With the following modifications I was able to get it to build and run:

• Amend Dockerfile to run instead poetry install --only main to skip dev dependencies that are causing the issue
• poetry add pyinstaller^4.0 # it's only added as a dev dependency, which isn't strictly true
• poetry add py # generated dist depends on it