Checkout repo in Docker build for README

Author: Marvin Rösch

.github/workflows/build-release.yml

@@ -32,6 +32,8 @@ jobs:
     needs: metadata
 
     steps:
+      - name: Checkout
+        uses: actions/checkout@v2
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1
       - name: Cache Docker layers