Support multi-arch builds in next-build GH Workflow

[AObuchow]

What does this PR do?

This PR extends the Next container build GitHub action to build the devworkspace-controller
& project-clone images for the following platforms:

• linux/amd64
• linux/arm64
• linux/ppc64le
• linux/s390x

Support for building the index, bundle and respect digest images for these platforms was also added in 8b80138. However, the implementation is a bit awkward: rather than using the docker buildx action, the buildx builder is manually setup and used in the build_digests_bundle.sh and build_index_image.sh scripts if the new --multi-arch flag is used.

Additionally, it seems that docker buildx uses a single virtual network layer for all platform builds which are run in parallel. When building the olm images, the opm --serve --cache-only command binds to localhost:6000, causing the other builds to fail as they cannot bind to the smart address/port. The quay.io/operator-framework/opm:latest image does not include a shell, so changing the port used based on the architecture we're building for is not possible (unless we copy over a shell from another image). As a workaround, I'm configuring the buildx builder to disable parallelism in the buildkitd.toml to prevent this race condition.

Che/DevSpaces might not even need the index, bundle and digest images to be built for multiple platforms anyhow -- so this commit could optionally be removed.

What issues does this PR fix or reference?

#559

Is it tested? How?

Since these changes only get triggered after merging to the main branch, I tested that the build-next-imgs & build-next-olm-imgs jobs succeeded on my fork.

The resulting images were build for all 4 architectures and pushed to my quay repo's:

• deworkspace-operator-bundle:next
• deworkspace-operator-bundle:next-digest
• devworkspace-operator-index:next
• devworkspace-operator-index:next-digest
• devworkspace-controller:next
• project-clone:next

PR Checklist

• E2E tests pass (when PR is ready, comment /test v8-devworkspace-operator-e2e, v8-che-happy-path to trigger)
  • v8-devworkspace-operator-e2e: DevWorkspace e2e test
  • v8-che-happy-path: Happy path for verification integration with Che

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f4dd026) 52.78% compared to head (b270e62) 52.79%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1212   +/-   ##
=======================================
  Coverage   52.78%   52.79%           
=======================================
  Files          84       84           
  Lines        7604     7616   +12     
=======================================
+ Hits         4014     4021    +7     
- Misses       3302     3306    +4     
- Partials      288      289    +1     

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[amisevsk]

LGTM

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: amisevsk, AObuchow

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[openshift-ci]

New changes are detected. LGTM label has been removed.