Run a regression test (snapshot test) for zbpack

[pan93412]

Link: https://linear.app/zeabur/issue/ZEA-657

Regression testing (rarely, non-regression testing) is re-running functional and non-functional tests to ensure that previously developed and tested software still performs as expected after a change. If not, that would be called a regression. (Wikipedia, 2023)

The folder structure of the regression test can be like this:

-- zbpack (root)
 `- tests
  `- zea123-python-bug
   `- main.py
   `- requirements.txt
   `- expected.Dockerfile  <-- the working dockerfile

When the Dockerfile changes unexpectedly, it must be found in CI:

expected: ...
actual:   ...
diff:
  + ...
  - ...

[oshinsaraf]

Can you assign me this under GSSOC'23?

[MichaelYuhe]

Can you assign me this under GSSOC'23?

I've assigned this issue to you