fix(ci): restore the iOS 26 test leg dropped from PR and nightly runs

[james-enperso]

Problem

pr.yaml and nightly.yaml pass macos: ${{ matrix.macos }} to the reusable iOS workflow, but only the ^18 matrix leg defines macos:

matrix:
  ios: [^26, ^18]
  include:
    - ios: ^26
      xcode: ^26          # no macos
    - ios: ^18
      xcode: ^16
      macos: macos-15

For the ^26 leg matrix.macos is undefined, so an empty string is passed to the reusable workflow. That empty string overrides the callee's macos: { default: macos-latest }, leaving runs-on: ${{ inputs.macos }} empty — and GitHub creates no job for that leg: no run, no failure, no "skipped".

Effect: since this was introduced, every nightly and every PR has executed zero iOS 26 / Xcode 26 tests, while the iOS side of the run still reports green (only the ^18 leg runs). A regression that only surfaces on the newest iOS/Xcode lane — the primary support target — merges and ships with CI green, and nobody is told the leg is missing.

This was confirmed against the live GitHub jobs API: nightly runs after the change contain only 2 jobs (android + iOS ^18), with no ^26 job in any state.

Fix

Add macos: macos-latest to the ^26 include entry in both pr.yaml and nightly.yaml, so the input is never an empty string and the leg runs on the default runner again.

Test plan

• Confirm the next PR/nightly run contains the iOS ^26 job again (4 jobs total: android + iOS ^26 + iOS ^18, plus the permission gate).

🤖 Generated with Claude Code

https://claude.ai/code/session_015CGbVaRKrx7DeurX81NWdQ

[wmathurin]

Hi @james-enperso — thank you for catching this! Confirming it against the live GitHub jobs API was exactly the right move, and your root cause analysis is spot on.

We're closing this in favour of #476, which fixes the same regression but at the call site rather than in the matrix include entries:

# pr.yaml / nightly.yaml — with: block
macos: ${{ matrix.macos || 'macos-latest' }}

The reason: adding macos: macos-latest to each include entry works today but duplicates the default string across multiple files and leaves the codebase one forgotten entry away from the same silent-skip bug recurring. The || 'macos-latest' fallback at the call site is self-enforcing — any future matrix row that omits macos automatically gets the right runner without extra bookkeeping.

Your contribution is credited in the commit message of #476. Thanks again!