fix: use commit msg file in action

Author: denchenko

.github/workflows/generate-messageflow-docs.yml

@@ -56,16 +56,15 @@ jobs:
             git config user.email "messageflow-ci-bot@example.com"
             git add -A
 
-            COMMIT_MSG="Sync: ${{ github.event.client_payload.source_repo }}@${{ github.event.client_payload.source_sha }}"
+            echo "Sync: ${{ github.event.client_payload.source_repo }}@${{ github.event.client_payload.source_sha }}" > /tmp/commit_msg.txt
 
             # Add changes details if available
             if [ -n "${{ steps.generate-docs.outputs.changelog }}" ]; then
-              COMMIT_MSG="$COMMIT_MSG
-
-${{ steps.generate_docs.outputs.changes }}"
+              echo "" >> /tmp/commit_msg.txt
+              echo "${{ steps.generate_docs.outputs.changes }}" >> /tmp/commit_msg.txt
             fi
 
-            git commit -m "$COMMIT_MSG"
+            git commit -F /tmp/commit_msg.txt
             git remote set-url origin "https://x-access-token:${PAT}@github.com/${GITHUB_REPOSITORY}"
             git push
           fi