builder: Enable building images on arm64

[jrajahalme]

Add cross-compilation packages to builder when build target is
arm64. This allows Cilium image build to succeed. Without this
builer/cilium/download-hubble.sh failed due to missing
'x86_64-linux-gnu-strip'.

Also install 'binutils-x86-64-linux-gnu' whenever installing
'binutils-aarch64-linux-gnu' to fix gops build on arm64.

Signed-off-by: Jarno Rajahalme jarno@isovalent.com

Cilium images can now be built also on arm64.

Note: This PR supersedes #17948 in order to follow through with https://docs.cilium.io/en/latest/contributing/development/images/#update-cilium-builder-and-cilium-runtime-images.

Fixes: #17056

[jrajahalme]

@joestringer Keeping this as draft until I get through all the hoop in https://docs.cilium.io/en/latest/contributing/development/images/#update-cilium-builder-and-cilium-runtime-images

[jrajahalme]

@joestringer runtime image build is waiting for review, status shows as:

Waiting for review: release-base-images needs approval to start deploying changes.

I did not see this step being documented, unless this is covered by:

Ping one of the members of team/build to approve the build that was created by GitHub Actions here. Note that at this step cilium-builder build failure is expected since we have yet to update the runtime digest.

Maybe review == approval here?

[jrajahalme]

/test

Job 'Cilium-PR-K8s-1.23-kernel-net-next' failed and has not been observed before, so may be related to your PR:

Click to show.

Test Name

K8sUpdates Tests upgrade and downgrade from a Cilium stable image to master

Failure Output

FAIL: terminating containers are not deleted after timeout

If it is a flake, comment /mlh new-flake Cilium-PR-K8s-1.23-kernel-net-next so I can create a new GitHub issue to track it.

[jrajahalme]

/mlh new-flake Cilium-PR-K8s-1.23-kernel-net-next

👍 created #18456

[pchaigno]

The GKE CI job failed with known flake #17307; k8s-1.23-kernel-net-next with known flake #18447. Reviews are in. Merging.