Use Debian:stretch-slim for newer images

[andrerom]

While I still think there should be alpine variant of this image (#53), independently of whatever oracle does, the base debain image should be updated to use debian:stretch-slim, at the very least for mariadb:10.3. As this seems to be the new standard debian base image most new versions of official images use.

[waja]

And there is to mention that LTS Support for Debian Jessie ends at 31st May 2018.

[schliflo]

@waja according to your link support for Wheezy will end 31st May 2018. Jessie isn't even in LTS yet ;) - so that should be fine until 2020

[waja]

@waja according to your link support for Wheezy will end 31st May 2018. Jessie isn't even in LTS yet ;) - so that should be fine until 2020

Oh dear ... since some time I'm messing with Debian code names. Thats way too much to memory since potato. :)

[colinmollenhour]

A report on my Galera image project mentions that there is a bug in tail that is fixed in the newer versions so that is one issue that upgrading would fix:

colinmollenhour/mariadb-galera-swarm#33 (comment)

[tianon]

This was switched to Ubuntu instead in #184 (for better upstream support and thus better multiarch support), and the Ubuntu images are by default already "slim". 👍