ci: separate build matrix from workflow

.github/workflows/build.yml

@@ -24,7 +24,7 @@ on:
                 default: "20"
             experimental:
                 required: false
-                default: "false"
+                default: false
             ref:
                 description: "The branch or tag to checkout"
                 required: false
@@ -154,7 +154,6 @@ jobs:
                     exit 1
                 fi
 
-            # If there are changes, capture and upload them as an artifact
             - name: Upload changes
               if: ${{ failure() }}
               uses: actions/upload-artifact@v4