Update cmake-multi-platform.yml

.github/workflows/cmake-multi-platform.yml

@@ -3,10 +3,7 @@
 name: CMake on multiple platforms
 
 on:
-  push:
+  workflow_dispatch:
-    branches: [ "main" ]
-  pull_request:
-    branches: [ "main" ]
 
 jobs:
   build:
@@ -25,7 +22,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, windows-latest]
         build_type: [Release]
-        c_compiler: [gcc, clang, cl]
+        c_compiler: [gcc, cl]
         include:
           - os: windows-latest
             c_compiler: cl