ci: revert release runners to macos-15#480
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zig 0.15.2 (pinned by the ghostty v1.3.1 submodule) cannot link against the macOS 26 SDK on the macos-26 runner: `zig build` fails to link its own build runner with undefined libSystem symbols (_abort, _malloc_size, __availability_version_check, dispatch/*). This first surfaced on the v0.1.76 release build, where the ghostty xcframework cache was cold and the build had to compile from source. Revert the runner bump from #472 until ghostty/zig support the macOS 26 SDK. macos-15 is still GA and built every prior release successfully. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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May 29, 2026
Reverts the 0.1.76 release commit (#448). The 0.1.76 build failed because the macos-26 runner can't link zig 0.15.2 (see #480, now reverted to macos-15), and the empty v0.1.76 tag/release were deleted. Reverting the manifest/changelog/version bump lets release-please re-cut a fresh 0.1.76 off the macos-15 main so it builds and ships cleanly. Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Why
The v0.1.76 release build failed. Root cause: zig 0.15.2 cannot link against the macOS 26 SDK on the
macos-26runner (Xcode 26.4.1).zig builddies linking its own build runner with undefined libSystem symbols (_abort,_malloc_size,__availability_version_check,dispatch_*). It surfaced now because the ghostty xcframework cache was cold (6 weeks since last release → evicted), forcing a from-sourcezig build.zig 0.15.2 is pinned by the ghostty v1.3.1 submodule, so we can't simply bump zig.
mlugg/setup-zigwould fail identically — this is not related to the install method change in #478.Change
Revert the runner bump from #472 (
macos-26→macos-15) inrelease.ymlandtest-ghostty.yml.macos-15is still GA and built every prior release. Revisit macos-26 when ghostty/zig support the macOS 26 SDK.🤖 Generated with Claude Code