potiuk opened a new pull request, #38107:
URL: https://github.com/apache/airflow/pull/38107
This is another step of decomposing our workflows and introducing more DRY
approach for GitHub Actions workflows we have. Building cache started to take
more time and space as we started to build 5 images at the same time with
Python 3.12 inclusion, so optimizing the builds now is a good idea.
There are several optimizations here:
1) Instead of building images in parallel on bigger instances, we
rather choose to start small ARM instances with less CPUs but
build one image per instance. This will make them generally
faster with the same price (less contention) at the expense
of using more AMD instances to drive them
2) However we also make sure to build both AMD and ARM cache at
the same time in parallel - the AMD on the driving AMD instance and
the ARM on the ARM instance. This will make the AMD instances also
busy while ARM instance is building their images - and AMD instance
will be finishing faster in general rather than waiting for all the
5 images to complete.
In order to accomplish it we change the parallelism model when the
`--prepare-buildx-cache` command is used - instead of parallelising with python
versions we parallelise with the platforms, which allows to run both AMD and
ARM image in parallel.
This change also removes building ARM image in build-images step as it is
not really needed for anything - we already do such build in the CI workflow
and builing it again in "build images" workflow is superfluous.
Builds on changes implemented in #37865 and #38057
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