Split the jobs into two files, macOS and macOS-legacy.

.github/workflows/macos-legacy.yml

@@ -0,0 +1,37 @@
+# GitHub Actions workflow to run tests on macOS.
+name: "macOS-legacy"
+
+on:
+  push: {}
+  pull_request: {}
+  schedule:
+    - cron: "0 0 * * 0" # At 00:00 weekly on Sunday.
+
+concurrency:
+  group: "${{ github.workflow }}-${{ github.ref }}"
+  cancel-in-progress: true
+
+jobs:
+  test:
+    name: "${{ matrix.os }}/${{ matrix.arch }}"
+    runs-on: "${{ matrix.os }}"
+    if: ${{ github.repository_owner == 'libressl' || github.event_name != 'schedule' }}
+    permissions:
+      contents: read
+    strategy:
+      fail-fast: false
+      matrix:
+        os: ["macos-13", "macos-12"]
+        arch: ["arm64", "x86_64"]
+    steps:
+    - name: "Install required packages"
+      run: brew install automake
+
+    - name: "Checkout repository"
+      uses: actions/checkout@v4
+
+    - name: "Run tests"
+      run: ./scripts/test
+      env:
+        ARCH: "${{ matrix.arch }}"
+        OS: "${{ matrix.os }}"

.github/workflows/macos.yml

@@ -21,7 +21,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: ["macos-14", "macos-13", "macos-12"]
+        os: ["macos-14"]
         arch: ["arm64", "x86_64"]
     steps:
     - name: "Install required packages"