【GithubAction】PR時をした際にコメント欄に任意の文字列を入れ込む

例

name: Comment to PR

on:
  pull_request:
    types: [opened]

jobs:
  comment:
    name: "comment to PR"
    runs-on: ubuntu-latest
    steps:
      - name: Make comment body
        id: make-terraform-comment
        run: |
          comment_body_file="/tmp/pr_comment_body.txt" # 出力先ファイル

          echo "test" >> ${comment_body_file}

          # 次のステップで使うためにset-output
          echo ::set-output name=header::changeset-comment # 後述
          echo ::set-output name=result::${comment_body_file} # 出力先ファイル

      - name: Comment on pull request
        uses: marocchino/sticky-pull-request-comment@v1
        with:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          header: "header"
          path: ${{ steps.make-terraform-comment.outputs.result }}