Update test-install.yml

Install dependencies for smoke test on Linux

Author: compnerd

.github/workflows/test-install.yml

@@ -34,10 +34,14 @@ jobs:
     - name: Check Swift version
       run: swift --version
 
-    - name: get macOS smoke test prerequisites
+    - name: Install pre-requisites for smoke test
       if: ${{ runner.os == 'macOS' }}
       run: brew install ninja
 
+    - name: Install pre-requisites for smoke test
+      if: ${{ runner.os == 'Linux' }}
+      run: sudo apt-get update && sudo apt-get install -y ninja-build
+
     - name: Smoke test
       run: cmake -GNinja -S .github/smoke-test -B .cmake-build && cmake --build .cmake-build