fix release tag

Author: robkooper

.github/workflows/release.yml

@@ -37,6 +37,8 @@ jobs:
           VERSION=$(echo "${{ github.ref }}" | sed -e 's,.*/\(.*\),\1,')
           # Strip "v" prefix from tag name
           [[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION | sed -e 's/^v//')
+          [[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION | sed -e 's/^betydb_//')
+          
           # Use Docker `latest` tag convention
           [ "$VERSION" == "master" ] && VERSION=latest