TRG 4.02 Using un-altered container base image

[SebastianBezold]

The Dockerfile present for tag v0.2.14 (the release version) does use the alpine package manager to upgrade system dependencies.
These kind of upgrades alter the base container image in a way, that we cannot rely on the published container scans provided by DockerHub.
Therefore package manager updates/upgrades must not be present in our Dockerfiles

See the upgraded TRG 4.02 descriptions for a more detailed explanation

[shijinrajbosch]

Hi @SebastianBezold,

Thanks for the review comment. We will check the issue.