use pr body text to mark PR region

.github/workflows/update_api.yml

@@ -48,6 +48,19 @@ jobs:
         echo UPDATE_NEEDED is "${UPDATE_NEEDED}"
         echo API version is "${API_VERSION}"
       continue-on-error: true
+    - name: Create PR body text
+      if: env.UPDATE_NEEDED == 'true'
+      run: |
+        touch pr_body.txt
+        echo "## Automated JSON API Update" >> pr_body.txt
+        echo "Hello! This is an automatic pull request to merge the new JSON API version **${API_VERSION}** into the master branch." >> pr_body.txt
+        echo "### Details" >> pr_body.txt
+        echo "- **Workflow Trigger**: This update is triggered by the **Update JSON API (recurring job)** workflow." >> pr_body.txt
+        echo "- **Reason for Update**: A new JSON schema version was generated that differs from the existing one in the repository." >> pr_body.txt
+        echo "### Notes" >> pr_body.txt
+        echo "- If you notice any issues or have questions regarding this update, please contact @alchem0x2a or other maintainers of the repository." >> pr_body.txt
+        echo "Thank you for keeping the SPARC-X-API project up-to-date! 🚀" >> pr_body.txt
+        cat pr_body.txt
     - name: Create Pull Request
       if: env.UPDATE_NEEDED == 'true'
       run: |
@@ -61,18 +74,10 @@ jobs:
         git add sparc/sparc_json_api/parameters.json
         git commit -m "Add new json api version ${API_VERSION}"
         git push --force --set-upstream origin ${BRANCH_NAME}
-        body_msg=""
-        body_msg="${body_msg}## Automated JSON API Update\n"
-        body_msg="${body_msg}Hello! This is an automatic pull request to merge the new JSON API version **${API_VERSION}** into the master branch.\n\n"
-        body_msg="${body_msg}### Details:\n"
-        body_msg="${body_msg}- **Workflow Trigger**: This update is triggered by the **Update JSON API (recurring job)** workflow.\n"
-        body_msg="${body_msg}- **Reason for Update**: A new JSON schema version was generated that differs from the existing one in the repository.\n\n"
-        body_msg="${body_msg}### Notes:\n"
-        body_msg="${body_msg}- If you notice any issues or have questions regarding this update, please contact @alchem0x2a or other maintainers of the repository.\n\n"
-        body_msg="${body_msg}Thank you for keeping the SPARC-X-API project up-to-date! 🚀\n"
+
         gh pr create --base master \
                      --title "[PR Bot] New JSON API version ${API_VERSION}"  \
-                     --body "${body_msg}" \
+                     --body-file pr_body.txt \
                      -R ${{ github.repository_owner }}/SPARC-X-API
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}