Delete apk --update and rm /var/cache/apk/*

[suzukaze]

apk --no-cache is allows users to install packages with an index that is updated and used on-the-fly and not cached locally.
This avoids the need to use --update and remove /var/cache/apk/* when done installing packages.

Refer:Disabling Cache at docker-alpine.

Build an image with a new Dockerfile and run it:

$ docker build -t suzukaze/fluentd:0.12 .
$ docker run -it --rm suzukaze/fluentd:0.12 sh
~ $ ls /var/cache/apk
~ $

/var/cache/apk directory is empty.

[repeatedly]

I see. Thanks!