Enable multi-platform image builds with docker buildx

Given PR propose an alternative build back-end that allow multi-platform build & test of LAVA docker images.

Major changes/improvements:

• aarch64 & arm64 merged to a single dockerfiles directories following below structure:

  dockerfiles/
       └── <IMAGE_NAME>
            ├── flavor-a.Dockerfile
            ├── flavor-b.Dockerfile
            └── test.sh
  
  # Dockerfiles are still created from Jinja2 templates extending base.jinja2
  share/templates/
       └── <IMAGE_NAME>
            ├── flavor-a.Dockerfile.jinja2
            └── flavor-b.Dockerfile.jina2

  • Files (eg: test.sh) are no longer duplicated in every platform/debian version.
  • Dependencies are identical not matter the platform, such as tests
• Multi-stage base.jinja2
  • build -> test -> final
  • build: legacy base.jinja2 including few optimizations related to cache.
  • test: new Execute tests.sh and store logs in /var/log/ci_tests.log
  • final: new Create the final image from scratch and copy rootfs from build (single layer image)
    Note: tests logs are included in final to keep a dependency on test stage (ensure test execution during image build)
• Add docker-bake.hcl
  • Replacement for build.sh
  • Store all available targets
• Add Makefile: used in gitlab-ci, act as shortcut for few actions on the project
• Gitlab-CI
  • Build all images for all supported platform (excluding analyze which remains amd64 only)
  • Add final stage creating multi-platform manifests
  • Change runner to saas-linux-small-arm64 for arm64 jobs. medium is only available with paid versions of gitlab.
• Container Registry
  • Naming convention changed to limit the number of docker repositories
  • Flavors are platforms are specified in tags
  • Service set the repository name
  • Platform specific tag: ci-image/dispatcher:debian-12-arm64
  • Multi-platform tag: ci-image/dispatcher:debian-12

Screenshots from registry:

Signed-off-by: Thomas Mahé thomas.mahe@nxp.com