Add code signing support for XCFrameworks

[Kyle-Ye]

Summary

• Sign all 7 xcframeworks (main + 6 dependency stubs) with a self-signed "OpenSwiftUI" certificate during the release build
• Import signing certificate from GitHub secrets via apple-actions/import-codesign-certs@v3
• Gracefully skip signing when certificate is not available (external contributor PRs, manual builds)

Changes

• Scripts/build_xcframework.sh — added signing step after xcframework creation
• .github/actions/build-xcframework/action.yml — added certificate import step and new inputs
• .github/workflows/release.yml — pass signing secrets to the composite action

Setup required

Add these GitHub repo secrets:

• SIGNING_CERTIFICATE_BASE_64 — base64-encoded .p12 certificate
• SIGNING_CERTIFICATE_PASSWORD — password for the .p12 file

Test plan

• Verify release workflow still succeeds without secrets (signing skipped)
• Add secrets and verify xcframeworks are signed in release
• Verify signature with codesign -dv --verbose=4 OpenSwiftUI.xcframework

[augmentcode]

🤖 Augment PR Summary

Summary: This PR adds optional code-signing for the generated XCFramework artifacts during the release build.

Changes:

• Extends the build-xcframework composite action with inputs for a base64-encoded .p12 certificate and password.
• Imports the signing certificate in CI using apple-actions/import-codesign-certs@v3 when provided.
• Passes signing secrets from .github/workflows/release.yml into the composite action.
• Runs codesign over the main XCFramework and dependency-stub XCFrameworks after building, and skips signing when no certificate is available.

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[augmentcode]

Review completed. 2 suggestions posted.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 26.85%. Comparing base (cd9a5fc) to head (a99f773).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #844      +/-   ##
==========================================
- Coverage   26.85%   26.85%   -0.01%     
==========================================
  Files         671      671              
  Lines       43470    43470              
==========================================
- Hits        11675    11672       -3     
- Misses      31795    31798       +3     

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