Test build on macos-13

Author: m-kessler

.github/workflows/build.yml

@@ -2,27 +2,15 @@ name: CI
 
 on:
   push:
-    branches: [ main ]
-    tags: [ 'v*' ]
-  pull_request:
-    branches: [ main ]
+    branches: [ 'github-workflow' ]
 
 jobs:
   build:
     strategy:
       matrix:
         include:
-          - name: win64
-            image: windows-2022
-            cmake-args: -G "Visual Studio 17 2022" -A x64
-          - name: win32
-            image: windows-2022
-            cmake-args: -G "Visual Studio 17 2022" -A Win32
-          - name: linux64
-            image: ubuntu-20.04
-            cmake-args: -G "Unix Makefiles"
           - name: darwin64
-            image: macos-12
+            image: macos-13
             cmake-args: -G "Unix Makefiles" -D CMAKE_OSX_ARCHITECTURES=x86_64
     runs-on: ${{ matrix.image }}
     steps: