tools/alpine: Update to Alpine Linux 3.9
-FROM alpine:3.8 AS mirror
+FROM alpine:3.9 AS mirror
# update base image
RUN apk update && apk upgrade -a
@@ -84,7 +84,7 @@ RUN set -e && \
cp iucode_tool /iucode_tool; \
fi
-FROM alpine:3.8
+FROM alpine:3.9
COPY --from=mirror /etc/apk/repositories /etc/apk/repositories
COPY --from=mirror /etc/apk/repositories.upstream /etc/apk/repositories.upstream
