Add autocrlf option for Windows

[jeroen]

I'm frequently debugging issues on my Windows builds which are due to the default git behavior of automatically changing line endings upon checkout. This default behavior sort-of makes sense for Windows users to edit text files in editors, but for CI it's really unfortunate.

It would be really nice to have a native option to disable autocrlf, and checkout the repo as-is.

Currently I use this as a workaround (before running this action):

    steps:
      - name: Prepare git
        run: git config --global core.autocrlf false

      - uses: actions/checkout@v2

But it would be nice if I could tell all the users of my action that they can just use:

- uses: actions/checkout@v2
  with: 
    autocrlf: false

Thanks!

[ericsciple]

@jeroen have you considered setting the desired value for the repo, in the the .gitattributes file?

[matthijskooijman]

I also just ran into this, resulting in modified line endings in a generated source tarball.

have you considered setting the desired value for the repo, in the the .gitattributes file?

As @jeroen already mentioned, line translation can be useful for Windows users and their editors, so disabling it repository-wide might not be ideal. In this sense you just want consistent behaviour across the CI platforms, so specifying it at the CI-level makes sense to me.

[umarcor]

Coming from #250, this is an issue if git from MSYS2 is used. In my use cases, I found core.autocrlf input to fix it. Hence, having a crlf option in this action would be really helpful.

[gtirloni]

I just ran into this issue today. We don't want to use gitattributes because it imposes a way of working that developers might not like. And it's really only happening on Windows CI machines.

[umarcor]

@gtirloni you might find the workaround in https://github.com/msys2/setup-msys2#usage to be useful.

[jkroepke]

If you repository contains submodules, git config --global core.eol lf is required, too.

    steps:
      - name: Prepare git
        run: |-
          git config --global core.autocrlf false
          git config --global core.eol lf

      - uses: actions/checkout@v2

[kriegaex]

This seems to be a duplicate or at least closely related to #135. I am going to comment on the older issue.