Make all Debian images slim

13 jobs for update/slim in 1 minute and 12 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
canceled #2896
lint-dockerfile

00:01:05

canceled #2897
lint-shell-script

00:01:12

 
  Deploy
skipped #2899
build-debian-buster-build-dev
skipped #2901
build-debian-jessie-build-dev
skipped #2900
build-debian-stretch-build-dev
skipped #2902
build-debian-wp-org-deploy-build-dev
skipped #2898
build-golang-dev
skipped #2908
allowed to fail
build-php-5.3-dev
skipped #2907
allowed to fail
build-php-5.6-dev
skipped #2906
allowed to fail
build-php-7.0-dev
skipped #2905
build-php-7.1-dev
skipped #2904
build-php-7.2-dev
skipped #2903
build-php-7.3-dev