Provide a list of files to the `src`

[lfgcampos]

Is your feature request related to a problem? Please describe ⚡️

I would like to do an automatic rsync but only to the files changes on my last commit.
AFAIK, rsync supports this but I am not sure if the action does.

Describe the solution you'd like ✨

Using bash/git, I can get a list of changed files and would like to use them as my input src making sure only those files are rsync-ed.

Describe alternatives you've considered 🎡

N/A

Additional context 🖼

An example would be something like this:

jobs:
  changed-files:
    name: Changed files
    runs-on: ubuntu-latest
    # Map a step output to a job output
    outputs:
      all: ${{ steps.changes.outputs.all}}
    steps:
        # Make sure we have some code to diff.
      - name: Checkout repository
        uses: actions/checkout@v2
        with:
          fetch-depth: 0
      - name: Get changed files
        id: changes
        # Set outputs using the command.
        run: |
          echo "::set-output name=all::$(git diff --name-only --diff-filter=ACMRT ${{ github.event.pull_request.base.sha }} ${{ github.sha }} | xargs)"

  deploy:
    - name: Deploy to server
      id: deploy
      uses: Pendect/action-rsyncer@v1.1.0
      env:
        DEPLOY_KEY: ${{secrets.DEPLOY_KEY}}
      with:
        flags: '-avzr --delete'
        options: ''
        ssh_options: ''
        src: '${{needs.changed-files.outputs.all}}'
        dest: 'user@server.com:/var/www/server.com'

    - name: Display status from deploy
      run: echo "${{ steps.deploy.outputs.status }}"