Add common scripts to get original PR's information in other bot-sdk repositories

[Yang-33]

Currently, the bot-sdk repositories automatically create PRs based on updates to line-openapi.

The titles and descriptions of these automatically generated PRs are sometimes filled in by maintainers, but not always. I realized that when creating a PR in the SDK repositories, we can obtain information such as the title and description by retrieving the PR information from line-openapi.

I have implemented and tested a proof of concept for this. Since it seems practical, this change adds scripts to line-openapi. While we could write the same script in each SDK repository, placing it in line-openapi makes maintenance easier. Since line-openapi is registered as a submodule in the bot-sdk repositories, we can call the same script.

In each SDK repository, we need to write a GitHub workflow like the following:

name: Generate OpenAPI based code

on:
  workflow_dispatch:
  push:
    branches:
      - master

jobs:
  tests:
    name: Generate OpenAPI based code
    runs-on: ubuntu-latest

    steps:
      # Setup
      - uses: actions/checkout@v4
        with:
          submodules: recursive
      - name: Update submodules
        run: git submodule update --remote --recursive
+     - uses: actions/setup-node@v4
      - uses: actions/setup-java@v4
        with:
          distribution: 'temurin'
          java-version: 17
          architecture: x64

      - name: Install Dependency
        run: npm ci

      # Generate codes
      - run: |
          python3 generate-code.py
      - run: |
          diff=$(git --no-pager diff --name-only)
          echo "DIFF_IS_EMPTY='false'" >> $GITHUB_ENV
          echo "CURRENT_DATETIME=$(date +'%Y%m%d%H%M%S')" >> $GITHUB_ENV
      - if: ${{ env.DIFF_IS_EMPTY != 'true' }}
        run: |
+         # Determine Change Type via Submodule Script
+         CHANGE_TYPE=$(npx zx ./line-openapi/tools/determine-change-type.mjs)
+         echo "Determined change type: $CHANGE_TYPE"

+         # Determine PR title and body
+         if [ "$CHANGE_TYPE" == "submodule-update" ]; then
+           # Fetch PR info from submodule
+           npx zx ./line-openapi/tools/get-pr-info.mjs
+           PR_INFO=$(cat pr_info.json)
+           TITLE=$(echo "$PR_INFO" | jq -r '.title')
+           BODY=$(echo "$PR_INFO" | jq -r '.url')$'\n\n'$(echo "$PR_INFO" | jq -r '.body')
+         else
+           # Default PR title and body
+           TITLE="Codes are generated by openapi generator"
+           BODY="⚠Reviewer: Please edit this description to include relevant information about the changes.⚠"
          fi

          BRANCH_NAME="update-diff-${{ env.CURRENT_DATETIME }}"

          git config user.name github-actions
          git config user.email [email protected]
          git checkout -b $BRANCH_NAME

          git add line-openapi
          git add lib/**
          git commit -m "Codes are generated by openapi"

+         git push origin $BRANCH_NAME
+         gh pr create -B ${{ github.ref_name }} -H $BRANCH_NAME -t "$TITLE" -b "$BODY" --label "line-openapi-update"
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

As a result, we may automate PR title and description like this in each bot-sdk repository:

[Yang-33]

Code is generated in each repository in the following two cases:

1. When a maintainer manually executes GitHub Actions.
2. When Renovate pushes a commit that updates line-openapi, triggering GitHub Actions to run.

In other cases, the line-openapi PR description should not be reflected.