Make the build chain container runtime engine agnostic #4345
Description
What happened:
A contributor that would like to use a container engine different from docker could experience some issues.
Even if in the Makefile there is the chance to switch to a different container engine setting DOCKER = <your preferred container engine> in other bash scripts referenced into the Makefile this is not possible (i.e. build-and-push.sh and verify-docker-build.sh)
What you expected to happen:
Having the chance to select the preferred container runtime engine setting an envoriment variable that will be used across all the scripts (i.e. BUILDER = docker or CONTAINER_ENGINE = docker ) in the build chain
How to reproduce it (as minimally and precisely as possible):
If you have got a different container runtime engine than docker on your workstation and you try to execute a make it will fail with error
'docker' is not recognized as an internal or external command
Anything else we need to know?:
It will nice to replace all the occurrence to docker in the file name to something like BUILDER or CONTAINER_ENGINE