A proposal to add an s390x (IBM Z / LinuxONE) GitHub Actions runner to the Erlang/OTP CI pipeline. IBM now offers free hosted s390x runners for open-source projects through their sponsorship program. Since s390x is a big-endian 64-bit architecture, adding it would close a gap in Erlang/OTP's CI coverage, which currently only tests on little-endian platforms (x86-64 and aarch64). The author offers to help draft a PR and coordinate with IBM.
Questions this post answers
Does IBM offer free GitHub Actions runners for s390x open-source projects?
Yes, IBM provides free hosted s390x GitHub Actions runners for open-source projects through their open-source sponsorship program. The runners cover IBM Z and LinuxONE architectures. Onboarding is documented at the IBM/actionspz repository on GitHub, and the program was announced in May 2025. Teams evaluating CI architecture coverage for open-source projects track sponsorship programs like this on daily.dev.