support DOCKER_DEFAULT_PLATFORM when 'compose up --build'
add tests to check behaviour when DOCKER_DEFAULT_PLATFORM is defined
Signed-off-by: Guillaume Lours <705411+glours@users.noreply.github.com>
As of Go 1.16, the same functionality is now provided by package io or
package os, and those implementations should be preferred in new code.
So replacing all usage of ioutil pkg with io & os.
Signed-off-by: Abhinav Nair <11939846+abhinavnair@users.noreply.github.com>