update: sponsor migrations 생성

Author: golony6449

.github/workflows/pull-request-merge-precondition.yml

@@ -14,7 +14,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: psf/black@stable
         with:
-          options: "--check --verbose"
+          options: "--check --verbose --exclude migrations"
 
       - uses: isort/isort-action@master
         with: