Gitignore .DS_Store and similar files

[mattstein]

The Problem/Issue/Bug:

One might easily and accidentally commit those annoying macOS .DS_Store files to their commit, adding cruft to the project.

How this PR Solves The Problem:

This uses the .gitignore file to prevent those from being noticed or committed by Git.

Manual Testing Instructions:

🤔 Stage this change, then purposefully try to commit a file named .DS_Store. It’ll be trickier, at least.

Automated Testing Overview:

n/a

Related Issue Link(s):

Faintly related to #4188; came up during #4336.

Release/Deployment notes:

n/a

[rfay]

Nothing wrong with that, but I gitignore stuff like that in global gitignore, I recommend to you as well.

My global .gitignore:

.project
.buildpath
.settings
nbproject/
.idea
.DS_Store
db/db_*
docroot/core/phpunit.xml
docroot/drush
docroot/sites/simpletest
docroot/modules/contrib/devel
sites/default/files
*.orig
*.rej
.tarballs

[mattstein]

Oh, that makes more sense! Thank you.

[tyler36]

Yes, a global .gitignore is definately great.

However, I think for a project like DDEV that recieves lots of contributions, it's helpful to have a project level one too.

[rfay]

May want to add a couple more of those if we're doing this one.

[mattstein]

I mean now that we’ve trained me to use a global file, I won’t be noticing whatever those other things are! 😅 🚀

[rfay]

Another pro tip: Always use git add -u when choosing changes for a commit. Then look and see what might be left over with git diff. The leftover stuff is normally cruft, unless you explicitly added a file, in which case git add <file>. If you use git add -u you'll almost never check in something you shouldn't have.