chore: add placeholder to git config inputs

[Emyrk]

Description

Shows the user the value that will be used if no value is inserted

Example: https://playground.coder.app/parameters/iS3csy5Th7

Type of Change

• Feature/enhancement

Module Information

Path: registry/coder/modules/git-config
Breaking change: [ ] Yes [x] No

[github-actions]

Version Bump Required

One or more modules in this PR need their versions updated.

To fix this:

1. Run the version bump script locally:

   ./.github/scripts/version-bump.sh patch

2. Commit the changes:

   git add . && git commit -m "chore: bump module versions (patch)"

3. Push your changes

The CI will automatically re-run once you push the updated versions.

[matifali]

LGTM. Good UX addition. Thanks.

Please bump a patch version.

[Emyrk]

Bumped!

[matifali]

@Emyrk could you run bun fmt Thanks. There is a CI failure.

[Emyrk]

@Emyrk could you run bun fmt Thanks. There is a CI failure.

@matifali I will get everything right in one of these commits! 😄