* 🐛 Make integration tests compatible w/ modern Git
This patch makes use of the `init.defaultBranch` setting to unify
the test across new and old Git versions since one defaults to
`master` and the other uses `main` for the default branch.
Where possible, it uses the `HEAD` committish to avoid having to
normalize the branch name.
The change fixes the following integration tests:
* `ansible-galaxy`
* `ansible-galaxy-collection-scm` (recursive collection)
* `git`
* 🐛Replace `git-symbolic-ref` with a repo template
This custom Git repository template emulates the `init.defaultBranch` setting
on Git versions below 2.28. Ref: https://superuser.com/a/1559582.
Other workarounds mentioned there, like invoking
`git symbolic-ref HEAD refs/heads/main` after each `git init` turned
out to have mysterious side effects that break the tests in surprising ways.
* 🎨 Make Git integration test non-destructive
This patch makes use of the `$HOME` environment variable to trick Git
into using a user-global config generated in the temporary directory.
c0e0550bce