Backport of #60742.
This PR resurrects support for building Docker images based on one of
Red Hat's UBI images. It also adds support for running the existing
Docker tests against the image. The image is named
`elasticsearch-ubi8:<version>`.
I also changed the Docker build file uses enums instead strings in a lot
of places, for added rigour.
- Replace immediate task creations by using task avoidance api
- One step closer to #56610
- Still many tasks are created during configuration phase. Tackled in separate steps
Docker informed us that for official multi-arch Docker builds, there
needs to be a single Dockerfile and build context that can be used for
each supported architecture. Therefore, rework the build to move the
relevant architecture logic into the Dockerfile, and merge the aarch64
/ x64 docker context builds.
Backport of #48849. Update `.editorconfig` to make the Java settings the
default for all files, and then apply a 2-space indent to all `*.gradle`
files. Then reformat all the files.
Rory Hunter
Rene Groeschke
Jason Tedor