Add macOS 13 & 15 builds and drop 12

.github/workflows/ci.yml

@@ -156,40 +156,24 @@ jobs:
         name: 'fvcbm-linux-arm'
         path: fvcbm
 
-  osx-12-x86_64:
-    name: 'macOS 12 on x86_64'
-    runs-on: macos-12
+  osx:
+    strategy:
+      fail-fast: false
+      matrix:
+        build:
+          os: [macos-13, macos-14, macos-15]
+    runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v4
-    - name: 'Compile with gcc on x86_64'
-      run: make linux
-    - name: 'Run tests with gcc on x86_64'
-      run: make test
-    - name: 'Compile fat binary with gcc on x86_64'
-      run: make clean && make linux LINUX_CC=cc LINUX_CFLAGS='-O2 -DUNIX -arch arm64 -arch x86_64'
-    - name: 'Run tests with fat binary with gcc on x86_64'
-      run: make test
-    - name: 'Strip binary'
-      run: strip fvcbm
-    - uses: actions/upload-artifact@v4
-      with:
-        name: 'fvcbm-macos'
-        path: fvcbm
-
-  osx-14-aarch64:
-    name: 'macOS 14 on aarch64'
-    runs-on: macos-14
-    steps:
-    - uses: actions/checkout@v4
-    - name: 'Compile with gcc on aarch64'
+    - name: 'Compile with gcc'
       # nroff is not available, so skip the man build
       run: touch fvcbm.man && make linux
-    - name: 'Run tests with gcc on aarch64'
+    - name: 'Run tests with gcc'
       run: make test
-    - name: 'Compile fat binary with gcc on aarch64'
+    - name: 'Compile fat binary with gcc'
       # nroff is not available, so skip the man build
       run: make clean && touch fvcbm.man && make linux LINUX_CC=cc LINUX_CFLAGS='-O2 -DUNIX -arch arm64 -arch x86_64'
-    - name: 'Run tests with fat binary with gcc on aarch64'
+    - name: 'Run tests with fat binary with gcc'
       run: make test
 
   freebsd-13: