Update rust.yml

Author: hacknus

.github/workflows/rust.yml

@@ -22,6 +22,7 @@ jobs:
 
     steps:
     - uses: actions/checkout@v3
+    - run: sudo apt-get install libgtk-3-dev
     - run: rustup update ${{ matrix.toolchain }} && rustup default ${{ matrix.toolchain }}
     - name: Build
       run: cargo build --verbose