Wagtail packaging fixes

[thibaudcolas]

This contains two unrelated changes:

• As part of Front-end tooling upgrade #7876, we forgot to convert one occurrence of npm run dist (now removed) to npm run build
• Excludes additional files from published artifacts as discussed in Ways to speed up Wagtail installs #6130.

I grouped them together basically because the testing steps are identical: run python setup.py sdist bdist_wheel. Make sure to rm -rf build *.egg-info dist so setuptools reliably determines which files are to be included without any caching.

Before/after on file size:

-8.4M	dist/wagtail-2.17a0-py3-none-any.zip
+8.3M	dist/wagtail-2.17a0-py3-none-any.zip
-5.7M	dist/wagtail-2.17a0.tar.gz
+5.5M	dist/wagtail-2.17a0.tar.gz

This is a pretty small difference but IMHO still worthwhile.

Here are the files / folders that will no longer be included, based on diffing the wheel’s contents (output of `find before/after:

wagtail/admin/static/wagtailadmin/fonts/wagtail-icomoon.json
wagtail/snippets/static_src
wagtail/images/static_src
wagtail/admin/static_src
wagtail/contrib/settings/static_src
wagtail/contrib/typed_table_block/static_src
wagtail/contrib/styleguide/static_src
wagtail/contrib/modeladmin/static_src
wagtail/search/static_src
wagtail/users/static_src
wagtail/documents/static_src
wagtail/embeds/static_src
wagtail/snippets/.gitignore
wagtail/images/.gitignore
wagtail/tests/.gitignore
wagtail/admin/.gitignore
wagtail/contrib/settings/.gitignore
wagtail/contrib/forms/.gitignore
wagtail/contrib/typed_table_block/.gitignore
wagtail/contrib/table_block/static/table_block/js/.gitignore
wagtail/contrib/styleguide/.gitignore
wagtail/contrib/modeladmin/.gitignore
wagtail/search/.gitignore
wagtail/users/.gitignore
wagtail/documents/.gitignore
wagtail/embeds/.gitignore

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Test this branch here: https://thibaudcolaschorepackaging-zewg6.squash.io

[zerolab]

question: given wagtail-icomoon lives under wagtail/admin/static_src/wagtailadmin/fonts will it not be excluded via prune **/statics_src? or is it copied to static by the front-end tooling?

[thibaudcolas]

Yes, it is currently being copied at wagtail/admin/static/wagtailadmin/fonts/wagtail-icomoon.json. I don’t know by what or why though 😅 .

[zerolab]

LGTM