fix: gen-migrations workflow

.gitea/workflows/gen-migrations.yml

@@ -10,7 +10,7 @@ jobs:
       volumes: ['/run/user/1001/docker.sock:/run/user/1001/docker.sock']
     steps:
       - uses: 'actions/checkout@v3'
-        with: { fetch-depth: 0, ref: 'origin/main', submodules: 'recursive' }
+        with: { fetch-depth: 0, ref: 'main', submodules: 'recursive' }
       - run: 'docker compose up -d'
       - name: 'git config'
         run: |