Add checkout step to release workflow

Author: yasuyuky

.github/workflows/release.yml

@@ -48,6 +48,8 @@ jobs:
         arch: [amd64, arm64, armhf]
     runs-on: ubuntu-latest
     steps:
+      - name: Checkout
+        uses: actions/checkout@v4
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
       - name: Build deb