Set title and description written in line-openapi PR again (#646)

same as line/line-bot-sdk-nodejs#1123

Author: Yang-33

.github/workflows/diff-check.yml

@@ -67,6 +67,24 @@ jobs:
       ## Run if diff exists and event is not pull request, and make PR
       - if: ${{ github.event_name != 'pull_request' && env.DIFF_IS_EMPTY != 'true' }}
         run: |
+          # Determine Change Type via Submodule Script. This scripts read current uncommited changes.
+          CHANGE_TYPE=$(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
+
+          # Create PR
           BRANCH_NAME="update-diff-${{ env.CURRENT_DATETIME }}"
           
           git config user.name github-actions
@@ -81,19 +99,6 @@ jobs:
           git commit --allow-empty -m "Update document"
           
           git push origin $BRANCH_NAME
-          
-          # Determine PR title and body
-          if [ "$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
 
           gh pr create -B ${{ github.ref_name }} -H $BRANCH_NAME -t "$TITLE" -b "$BODY" --label "line-openapi-update"
         env: