This adds "environments" to the release package that can be used to configure some environment variables. These variables will be loaded either by an `--env` argument or a `env` definition in the test definition and can be used to e.g. run release tests on staging.
Many release tests are currently failing for cuda version incompatibilities. Pinning the base image to 1.12.1 seems to resolve the problem for the time being.
We use tarfile to pack/unpack directories in several locations. Instead of using temporary files, we can just use io.BytesIO to avoid unnecessary disk writes.
Note that this functionality is present in 3 different modules - in Ray (AIR), in the release test package, and in a specific release test. The implementations should live in the three modules independently, so we don't add a common utility for this (e.g. the ray_release package should be independent of the Ray package).
This PR supports the job-based file manager and runner. It will be the backbone of k8s migration.
The PR handles edge cases that originally existed in the old e2e.py job-based runners.
Adds a unit-tested and restructured ray_release package for running release tests.
Relevant changes in behavior:
Per default, Buildkite will wait for the wheels of the current commit to be available. Alternatively, users can a) specify a different commit hash, b) a wheels URL (which we will also wait for to be available) or c) specify a branch (or user/branch combination), in which case the latest available wheels will be used (e.g. if master is passed, behavior matches old default behavior).
The main subpackages are:
Cluster manager: Creates cluster envs/computes, starts cluster, terminates cluster
Command runner: Runs commands, e.g. as client command or sdk command
File manager: Uploads/downloads files to/from session
Reporter: Reports results (e.g. to database)
Much of the code base is unit tested, but there are probably some pieces missing.
Example build (waited for wheels to be built): https://buildkite.com/ray-project/kf-dev/builds/51#_
Wheel build: https://buildkite.com/ray-project/ray-builders-branch/builds/6023
