use alpine:3.11 for docker client

tadly · tadly · commit f1e01fcf9524 · 2020-01-17T19:27:58.000+01:00
diff --git a/docker/Dockerfile b/docker/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:latest
+FROM alpine:3.11
 
 ENV BACKUP_SCHEDULE='0 0 * * *' \
     BACKUP_COMMAND='dups backup' \
