adding libgtk-3-dev for native file dialog

Author: PapeCoding

.github/workflows/cmake-multi-platform.yml

@@ -55,10 +55,10 @@ jobs:
       run: |
         echo "build-output-dir=${{ github.workspace }}/build" >> "$GITHUB_OUTPUT"
 
-    - name:  Install GLFW dependencies
-      # Install glfw dependiencies on ubuntu
+    - name:  Install dependencies on ubuntu
+      # Install thirdparty dependiencies on ubuntu
       if: matrix.os == 'ubuntu-latest'
-      run: sudo apt install -y libgl1-mesa-dev libxrandr-dev libxinerama-dev libxkbfile-dev libxcursor-dev libxi-dev
+      run: sudo apt install -y libgl1-mesa-dev libxrandr-dev libxinerama-dev libxkbfile-dev libxcursor-dev libxi-dev libgtk-3-dev
 
     - name: Configure CMake
       # Configure CMake in a 'build' subdirectory. `CMAKE_BUILD_TYPE` is only required if you are using a single-configuration generator such as make.