Matrix for extra checks

Author: nobu

.github/workflows/macos.yml

@@ -45,6 +45,7 @@ jobs:
             os: macos-14
           - test_task: check
             os: macos-15
+            extra_checks: [capi]
             capi_check: capi
           - test_task: check
             os: macos-13
@@ -166,7 +167,7 @@ jobs:
           builddir: build
         env:
           RUBY_TESTOPTS: '-v --tty=no'
-        if: ${{ matrix.capi_check }}
+        if: ${{ contains(matrix.extra_checks, 'capi') }}
 
       - uses: ./.github/actions/slack
         with:

.github/workflows/ubuntu.yml

@@ -39,7 +39,7 @@ jobs:
           - test_task: test-bundled-gems
           - test_task: check
             os: ubuntu-24.04
-            capi_check: capi
+            extra_checks: [capi]
           # ubuntu-24.04-arm jobs don't start on ruby/ruby as of 2025-09-04
           #- test_task: check
           #  os: ubuntu-24.04-arm
@@ -160,7 +160,7 @@ jobs:
           make: '$SETARCH make'
         env:
           RUBY_TESTOPTS: '-v --tty=no'
-        if: ${{ matrix.capi_check }}
+        if: ${{ contains(matrix.extra_checks, 'capi') }}
 
       - uses: ./.github/actions/slack
         with: