fix(Dockerfile): fix bci-base tag

Signed-off-by: Derek Su <[email protected]>

Author: derekbit

package/Dockerfile

@@ -36,7 +36,7 @@ RUN GRPC_HEALTH_PROBE_DOWNLOAD_URL=$(wget -qO- https://api.github.com/repos/grpc
     wget ${GRPC_HEALTH_PROBE_DOWNLOAD_URL} -O /usr/local/bin/grpc_health_probe && \
     chmod +x /usr/local/bin/grpc_health_probe
 
-FROM registry.suse.com/bci/bci-base:6 AS release
+FROM registry.suse.com/bci/bci-base:15.6 AS release
 
 ARG ARCH=amd64