ci: test installed packages using CMake

.github/workflows/vita.yaml

@@ -16,8 +16,25 @@ jobs:
     - name: Install CMake and GNU Make
       run: |
         apk update 
-        apk add cmake make
+        apk add cmake make ninja
     - name: Configure CMake
-      run: cmake -S. -Bbuild -DCMAKE_TOOLCHAIN_FILE=${VITASDK}/share/vita.toolchain.cmake -DCMAKE_BUILD_TYPE=Release
+      run: |
+        cmake -S . -B build -G Ninja \
+          -DCMAKE_TOOLCHAIN_FILE=${VITASDK}/share/vita.toolchain.cmake \
+          -DCMAKE_BUILD_TYPE=Release \
+          -DCMAKE_INSTALL_PREFIX=prefix
     - name: Build
-      run: cmake --build build
+      run: cmake --build build --verbose
+    - name: Install CMake
+      run: |
+        echo "SDL2_DIR=$(pwd)/prefix" >> $GITHUB_ENV
+        cmake --install build/
+        ( cd prefix; find ) | LC_ALL=C sort -u
+    - name: Verify CMake configuration files
+      run: |
+        cmake -S cmake/test -B cmake_config_build -G Ninja \
+          -DCMAKE_TOOLCHAIN_FILE=${VITASDK}/share/vita.toolchain.cmake \
+          -DTEST_SHARED=FALSE \
+          -DCMAKE_PREFIX_PATH=${{ env.SDL2_DIR }} \
+          -DCMAKE_BUILD_TYPE=Release
+        cmake --build cmake_config_build --verbose