Fix: Generate valid tar archives

[johnhany97]

Before this change

Archives produced from rattler-build, which under the hood use functionalities in this crate, couldn't be un-archived.

I manually proved this by persisting outputs of the write_tar_bz2 function in one of the tests, and then manually running

tar -xzvf pytweening-1.0.4-pyhd8ed1ab_0.tar-new.tar.bz2

which would before this change yield the following error:

tar: Error opening archive: Unrecognized archive format

This error would also appear if I were to try and install that package using mamba:

InvalidArchiveError('Error with archive /path/to/pytweening-1.0.4-pyhd8ed1ab_0.tar-new.tar.bz2.  You probably need to delete and re-download or re-create this file.  Message was:\n\nfailed with error: invalid header')

After this change

I can successfully un-archive the file

$ tar -xzvf pytweening-1.0.4-pyhd8ed1ab_0.tar-new.tar.bz2
x info/about.json
x info/files
x info/git
x info/hash_input.json
x info/index.json
x info/licenses/LICENSE.txt
x info/link.json
x info/paths.json
x info/recipe/conda_build_config.yaml
x info/recipe/meta.yaml
x info/recipe/meta.yaml.template
x info/recipe/recipe-scripts-license.txt
x info/test/run_test.bat
x info/test/run_test.py
x info/test/run_test.sh
x info/test/test_time_dependencies.json
x site-packages/pytweening/__init__.py
x site-packages/pytweening-1.0.4.dist-info/AUTHORS.txt
x site-packages/pytweening-1.0.4.dist-info/INSTALLER
x site-packages/pytweening-1.0.4.dist-info/LICENSE.txt
x site-packages/pytweening-1.0.4.dist-info/METADATA
x site-packages/pytweening-1.0.4.dist-info/RECORD
x site-packages/pytweening-1.0.4.dist-info/REQUESTED
x site-packages/pytweening-1.0.4.dist-info/WHEEL
x site-packages/pytweening-1.0.4.dist-info/direct_url.json
x site-packages/pytweening-1.0.4.dist-info/top_level.txt

and also install it directly using mamba.

[johnhany97]

This is a drive-by change. It's the other lines below that actually make the difference

[baszalmstra]

thanks! this looks great!