Enable build of multi-platform images (amd64, arm32 & arm64)

[Quetzacoalt91]

• Require merge of Add generator of backlog based on Distribution API contents #424 first.

Questions	Answers
Description?	This PR allows the docker images (prestashop/base and prestashop/prestashop) to be built for amd64, arm32 and arm64
Type?	new feature
BC breaks?	Nope
Deprecations?	Nope
Fixed ticket?	Fixes #315
Sponsor company	@PrestaShopCorp
How to test?	The existing commands generate the images for different kind of CPUs

• Given the time needed to build each image (given the emulation of other processors), the GitHub action workflow has been split for each image to generate

• Build test of Docker base images are done on quetzacoalt/base: https://hub.docker.com/repository/docker/quetzacoalt/base/tags
• Build test of Docker PrestaShop images are done on quetzacoalt/prestashop: https://hub.docker.com/repository/docker/quetzacoalt/prestashop/tags

[Quetzacoalt91]

Oh no, the workflow is being cancelled after 6 hours because it reached the timeout.

We can't use a single runner to build all the platforms at once. We'll have to split each job in two (amd64 an arm64) then merge their manifests.
--> https://docs.docker.com/build/ci/github-actions/multi-platform/#build-and-load-multi-platform-images

I actually had an infinite loop in the script... Let's try again before having to split the run

[tyloo]

Hey @Quetzacoalt91 ! Thanks for this PR! We, Mac arm users would really need this one. Any ETA on this? Thanks

[Quetzacoalt91]

The PR is ready for review , so it can be very soon. However note we should merge it outside the peak hours, because some of the jobs that will be triggered to build the images will need 50min to complete and we're limited to 10 runners on this GitHub organization.