Add support for one-shot stdin via .input()

[felipecrs]

This allows passing stdin for git commands like:

const trailers = await simpleGit()
   .input(commitMessage)
   .raw(['interpret-trailers', '--parse']);

Useful for commands like interpret-trailers --parse and hash-object --stdin.

Related:

• Passing standard input to raw #332
• Support Git trailers in commit messages #1046

I realized this limitation when working on renovatebot/renovate#44651, where I needed to call echo "commit message" | git interpret-trailers --parse.

So I thought this would be a nice and simple way to fix it, while still having room for future improvements like support for Streams.

[changeset-bot]

🦋 Changeset detected

Latest commit: 65039ca

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
simple-git	Minor

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR