[CI][C++][Go] Don't run jobs that use a self-hosted GitHub Actions Runner on fork #39057
Description
Describe the enhancement requested
Self-hosted GitHub Actions Runners are associated to apache/arrow . So we can't use them in fork repositories.
Self-hosted GitHub Actions Runner is used in cpp.yml and go.yml:
$ grep -r self-hosted .github/workflows/
.github/workflows/cpp.yml: runs-on: ["self-hosted", "arm", "linux"]
.github/workflows/go.yml: runs-on: ["self-hosted", "arm", "linux"]
.github/workflows/go.yml: runs-on: ["self-hosted", "arm", "linux"]Component(s)
C++, Continuous Integration, Go