Update get-changed-files action

[IlyaKhD]

Practical Value

Making the action feasible for usage in other use cases.

Fixed the case with empty paths filter

The paths is not required, but if not specified, empty list of files returned.

Before

    - uses: DevExpress/github-actions/get-changed-files@v1
      with:
        gh-token: XXX
        paths: '**/*'
        output: XXX

After

    - uses: DevExpress/github-actions/get-changed-files@v1
      with:
        gh-token: XXX
        output: XXX

Removed output

The files list is no longer saved to disk. Use the new json output instead, see usage examples.

Added outpus

files

A list of all changed files in the PR. Usage example:

    - run: |
        for file in ${{ steps.changed-files.outputs.files }}; do
          echo "$file"
        done

count

The number of all changed files in the PR. Usage example:

    - if: steps.changed-files.outputs.count > 2
      run: |
        echo "${{ steps.changed-files.outputs.count }}"

json

All data in JSON format, e.g. to use with jq
Data Schema:

type JsonSchema = {
  files: {
    path: string;
    status: string;
  } [];
  count: number;
};

Data sample:

{
  "files": [
    {
      "path": "path/to/file-0.txt",
      "status": "modified"
    },
    {
      "path": "file-1.ts",
      "status": "removed"
    },
    {
      "path": "file-2.js",
      "status": "modified"
    },
    {
      "path": "file-3.yaml",
      "status": "added"
    }
  ],
  "count": 4
}

Usage examples:

    # conditional step
    - if: fromJSON(steps.changed-files.outputs.json).count > 2
      run: |
        echo "${{ fromJSON(steps.changed-files.outputs.json).count }}"

    # output to disk
    - run: |
        jq -r <<< '${{ steps.changed-files.outputs.json }}' > changed-files-2.json

    # change data structure
    # [
    #   { "filename": "path/to/file1" },
    #   ...
    # ]
    - run: |
        jq -r '[.files[] | {filename: .path}]' <<< '${{ steps.changed-files.outputs.json }}' 

    # filter files by status  and change data structure:
    # file1
    # file2
    # ...
    -  run: |
        jq -r '.files[] | select(.status != "removed") | .path' <<< '${{ steps.changed-files.outputs.json }}'