use snapshot package

Author: netomi

Dockerfile

@@ -27,7 +27,7 @@ RUN /usr/bin/yarn --cwd website \
   && /usr/bin/yarn --cwd website build
 
 # Main image derived from openvsx-server
-FROM ghcr.io/eclipse/openvsx-server:${SERVER_VERSION}
+FROM ghcr.io/eclipse/openvsx-server-snapshot:${SERVER_VERSION}
 ARG SERVER_VERSION
 ARG SERVER_VERSION_STRING