Debug level logging (-vvv) should report when a .gitignore file was used to ignore a potential package file

[shaunco]

• [x] I have searched the issues of this repo and believe that this is not a duplicate.
• [x] I have searched the documentation and believe that my question is not covered.

Feature Request

After a very frustrating two days of trying to figure out why poetry build was silently ignoring all of the .py files in my package, I finally renamed a .gitignore file that was 3 parent directories above (../../../.gitignore) where I was running poetry build and my files were finally included.

While this is totally on me, as the docs point out that .gitignore files will be used, those two days would have been reduced to about 5 seconds if -vvv output something like:

Building myproj (0.1.0)
  - Building sdist
  - Ignoring: /home/test/some/dir/structure/myproj/myproj/__init__.py   (per /home/test/some/.gitignore)
  - Adding: pyproject.toml
  - Adding: README.md
  - Built myproj-0.1.0.tar.gz
  - Building wheel
  - Ignoring: /home/test/some/dir/structure/myproj/myproj/__init__.py   (per /home/test/some/.gitignore)
  - Ignoring: /home/test/some/dir/structure/myproj/myproj/test/__init__.py   (per /home/test/some/.gitignore)
Skipping: /home/test/some/dir/structure/myproj/myproj/LICENSE
Skipping: /home/test/some/dir/structure/myproj/myproj/COPYING
  - Built myproj-0.1.0-py3-none-any.whl

Where the lines that start with Ignoring is new, as currently it will just show:

Building myproj (0.1.0)
  - Building sdist
  - Adding: pyproject.toml
  - Adding: README.md
  - Built myproj-0.1.0.tar.gz
  - Building wheel
Skipping: /home/test/some/dir/structure/myproj/myproj/LICENSE
Skipping: /home/test/some/dir/structure/myproj/myproj/COPYING
  - Built myproj-0.1.0-py3-none-any.whl

[dimbleby]

Code is here if you'd like to submit an MR

[evanrittenhouse]

@dimbleby I've got a local branch with a logger.debug call to print out the ignored files. Should I submit the PR against Poetry or Poetry-Core?

[dimbleby]

the code is in poetry-core, that's where the MR will be

[github-actions[bot]]

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