Support setting a different OCI engine than docker
- Create OCI variable to override the docker engine
- Refactor the test-docker error message to expose this possibility
Signed-off-by: Nicolas signed-log FORMICHELLA <stigpro@outlook.fr>
echo"Sorry, this make target requires docker to be installed.";\
@if ! command -v $(OCI) > /dev/null 2>&1;then\
echo"Sorry, this make target requires docker to be installed, to use another docker-compatible engine, like podman, re-run the make command adding OCI=podman";\