Fix libbeat BK crosscompile step

[sharbuz]

What is the problem this PR solves?

Jenkins->Buildkite pipelines migration

The PR fixes the issues:
https://buildkite.com/elastic/beats-libbeat/builds/241#018d4186-2241-458f-adae-376886577d54
https://buildkite.com/elastic/beats-libbeat/builds/248#018d41c0-29d2-46d8-87d6-bbbae4c7271d
https://buildkite.com/elastic/beats-libbeat/builds/249#018d41cd-4648-46ba-b4bb-ac1cab28bd99

How does this PR solve the problem?

Exclude unsupported by GO combinations of GOX_OS/GOX_OSARCH

Related issues

https://github.com/elastic/ingest-dev/issues/1693

[botelastic]

This pull request doesn't have a Team:<team> label.

[v1v]

Can you explain what's the error if not updated? and also a link or copy of the error itself?

make: Entering directory '/opt/buildkite-agent/builds/bk-agent-prod-gcp-1706201338146898021/elastic/beats-libbeat/libbeat'
--
  | go install github.com/mitchellh/gox
  | mkdir -p /opt/buildkite-agent/builds/bk-agent-prod-gcp-1706201338146898021/elastic/beats-libbeat/libbeat/build/bin
  | gox -output="/opt/buildkite-agent/builds/bk-agent-prod-gcp-1706201338146898021/elastic/beats-libbeat/libbeat/build/bin/{{.Dir}}-{{.OS}}-{{.Arch}}" -os="linux darwin windows freebsd netbsd openbsd" -osarch="!darwin/arm !darwin/arm64"
  | Number of parallel builds: 15
  |  
  | -->   openbsd/amd64: github.com/elastic/beats/v7/libbeat
  | -->    linux/mipsle: github.com/elastic/beats/v7/libbeat
  | -->   freebsd/amd64: github.com/elastic/beats/v7/libbeat
  | -->     windows/386: github.com/elastic/beats/v7/libbeat
  | -->     linux/ppc64: github.com/elastic/beats/v7/libbeat
  | -->     linux/amd64: github.com/elastic/beats/v7/libbeat
  | -->      darwin/386: github.com/elastic/beats/v7/libbeat
  | -->    linux/mips64: github.com/elastic/beats/v7/libbeat
  | -->      netbsd/arm: github.com/elastic/beats/v7/libbeat
  | -->   windows/amd64: github.com/elastic/beats/v7/libbeat
  | -->    darwin/amd64: github.com/elastic/beats/v7/libbeat
  | -->    netbsd/amd64: github.com/elastic/beats/v7/libbeat
  | -->   linux/ppc64le: github.com/elastic/beats/v7/libbeat
  | -->     freebsd/386: github.com/elastic/beats/v7/libbeat
  | -->       linux/386: github.com/elastic/beats/v7/libbeat
  | -->     freebsd/arm: github.com/elastic/beats/v7/libbeat
  | -->      netbsd/386: github.com/elastic/beats/v7/libbeat
  | -->     linux/arm64: github.com/elastic/beats/v7/libbeat
  | -->       linux/arm: github.com/elastic/beats/v7/libbeat
  | -->     linux/s390x: github.com/elastic/beats/v7/libbeat
  | -->      linux/mips: github.com/elastic/beats/v7/libbeat
  | -->  linux/mips64le: github.com/elastic/beats/v7/libbeat
  | -->     openbsd/386: github.com/elastic/beats/v7/libbeat


2 errors occurred:
--
  | --> darwin/386 error: exit status 2
  | Stderr: go: unsupported GOOS/GOARCH pair darwin/386

I'd like to understand whether it's something broken in the current Jenkins pipeline, since I cannot see this in libbeat-crosscompile

...
[2024-02-06T06:19:48.671Z]   GOX_OSARCH: null
...
[2024-02-06T06:19:48.841Z] + make -C libbeat crosscompile
[2024-02-06T06:19:48.841Z] make: Entering directory '/var/lib/jenkins/workspace/main-2289-ef82a482-494b-4d96-b5b6-8b84710be033/src/github.com/elastic/beats/libbeat'
[2024-02-06T06:19:49.444Z] go install github.com/mitchellh/gox
[2024-02-06T06:19:49.847Z] mkdir -p /var/lib/jenkins/workspace/main-2289-ef82a482-494b-4d96-b5b6-8b84710be033/src/github.com/elastic/beats/libbeat/build/bin
[2024-02-06T06:19:49.847Z] gox -output="/var/lib/jenkins/workspace/main-2289-ef82a482-494b-4d96-b5b6-8b84710be033/src/github.com/elastic/beats/libbeat/build/bin/{{.Dir}}-{{.OS}}-{{.Arch}}" -os="linux darwin windows freebsd netbsd openbsd" -osarch="!darwin/arm !darwin/arm64" -arch amd64
[2024-02-06T06:19:52.156Z] Number of parallel builds: 7
[2024-02-06T06:19:52.156Z] 
[2024-02-06T06:19:52.156Z] -->   openbsd/amd64: github.com/elastic/beats/v7/libbeat
[2024-02-06T06:19:52.156Z] -->   windows/amd64: github.com/elastic/beats/v7/libbeat
[2024-02-06T06:19:52.156Z] -->     linux/amd64: github.com/elastic/beats/v7/libbeat
[2024-02-06T06:19:52.156Z] -->    darwin/amd64: github.com/elastic/beats/v7/libbeat
[2024-02-06T06:19:52.156Z] -->   freebsd/amd64: github.com/elastic/beats/v7/libbeat
[2024-02-06T06:19:52.156Z] -->    netbsd/amd64: github.com/elastic/beats/v7/libbeat

GOX_OSARCH=null since

beats/Jenkinsfile

Line 1046 in ac6e223

GOX_OSARCH: ${env.GOX_OSARCH}

- it uses the default variables defined in the Makefile

What's the reason those platforms are not the same in Jenkins and Builldkite?

[elasticmachine]

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• Start Time: 2024-02-06T12:18:46.126+0000

• Duration: 130 min 55 sec

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Failed	0
Passed	28777
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Total	30793

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[elasticmachine]

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cc @sharbuz

[dliappis]

LGTM

[jlind23]

LGTM