fix: docker image template to work on AWS

[SdgJlbl]

Patch to make the generated Dockerfile compatible with kaniko behaviour on AWS

[ThibaultFy]

Any chances that it impact the CVEs ?

[SdgJlbl]

Any chances that it impact the CVEs ?

it shouldn't, since the apt-get update was already done before (but it seems that the apt cache is flushed more often in AWS than in GCP, so we need to redo it before each command).

But then again, it's probably worth checking it again.