Marc Eichenseher

Add apt filename similar to ansible-role-docker

1

**What** When using the docker role and containerd role our source list gets a conflict. The docker role puts sources into docker.list while containerd puts those into whatever the default...

**Context** When a quantity value, defines no value it raises PHP exception undefined array key "value". **Fix** Applies same behavior as for unit/unitId -> Use null as default 

**What** Cleanup **Context** Seems to be a leftover from way back: - https://github.com/doctrine/orm/commit/c697a2d47f3c289276f2f73d741a2b930b0d6eea#diff-8be2a95c816ec2bcf28d186a4f18ef9fa4c48b849da2ae597e9d6d9398ca17f0R298 - TL;DR: Logic moved from `_gatherColumns` to `getSchemaFromMetadata`