Fix CMake top-level detection, install build with CI

.github/workflows/ubuntu.yml

@@ -22,3 +22,5 @@ jobs:
       run: cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} -GNinja
     - name: Build
       run: cmake --build ${{github.workspace}}/build --config ${{env.BUILD_TYPE}}
+    - name: Install
+      run: cmake --install ${{github.workspace}}/build --config ${{env.BUILD_TYPE}}

CMakeLists.txt

@@ -93,7 +93,7 @@ if (WITH_QT_EXAMPLE)
     add_subdirectory(examples/ragephoto-qtviewer)
 endif()
 
-if (CMAKE_PROJECT_NAME EQUAL "ragephoto")
+if (${CMAKE_PROJECT_NAME} STREQUAL "ragephoto")
     option(WITH_EXTRACT "Build libragephoto with ragephoto-extract" ON)
 else()
     option(WITH_EXTRACT "Build libragephoto with ragephoto-extract" OFF)