install ninja

.github/workflows/build-linux-gcc.yml

@@ -41,6 +41,7 @@ jobs:
 
             - name: Install Linux Dependencies
               run: |
+                sudo apt-get install ninja-build
                 ninja --version
                 cmake --version
                 gcc --version

.github/workflows/build-macos-clang.yml

@@ -38,6 +38,7 @@ jobs:
 
             - name: Install MacOSX Dependencies
               run: |
+                brew install ninja
                 ninja --version
                 cmake --version