Add towncrier files to ignore or rename .keep

[stevepiercy]

From a release on July 29, 2024, we need to either rename all towncrier fragments that we want to ignore to .keep or add .gitkeep to towncrier's new ignore configuration.

Reference: twisted/towncrier#622

@Tishasoumya-02 I know it's not your fault but the pull request isn't green
https://github.com/plone/volto/actions/runs/10196668962/job/28207886197?pr=6147
Due to
https://github.com/twisted/towncrier/blob/trunk/src/towncrier/_builder.py#L117

try to rename package/volto/news/.gitkeep to .keep as they recognize that as something to ignore.

Originally posted by @ichim-david in #6147 (comment)

[ichim-david]

@stevepiercy .gitkeep is a convention there isn't anything magical about it's naming other than to be more clear that it's for git to keep the folder from deleting if it were empty.

I opted to suggest to simply rename to .keep for plone/volto but as part as another pull request for this issue we could add .gitkeep as an ignore option to each package from the monorepo that uses towncrier if someone is willing todo it and contribute as a way to fix this issue this way.

[stevepiercy]

.gitkeep is used in every Plone repo I have seen so far. I'm actually surprised that this was included in the default list of ignored files in the upstream package. I think I'll make an issue and submit a PR with the suggestion, so that we don't have to make dozens of changes to comply with this change. It would be backward compatible.

[wesleybl]

I think I'll make an issue and submit a PR with the suggestion

@stevepiercy Yes! .gitkeep is very common. It shouldn't be a problem for towncrier.

[stevepiercy]

Issue created at twisted/towncrier#643 with offer to submit PR, if the maintainers agree.

[stevepiercy]

PR merged twisted/towncrier#647.

Awaiting release to revert the file rename.

[stevepiercy]

Towncrier 24.8.0 was released today, and I merged the #6232.