CI/code-quality: Check gui_vm/gtk_display example

Verify that the the executable gui_vm (and its dependency gtk_display) examples can
compile without warnings using `cargo clippy`.

This requires a newer version of GTK than we have in the CI, to solve build the
required GTK version from source and cache the built GTK libraries in Github cache.

Signed-off-by: Matej Hrica <[email protected]>

Author: mtjhrc

.github/workflows/code-quality.yml

@@ -82,7 +82,7 @@ jobs:
         with:
           path: ~/gtk-prefix
           key: ${{ runner.os }}-${{ runner.arch }}-gtk-4.16.0
-      
+
       - name: Install GTK system dependencies
         run: |
           sudo apt-get update
@@ -123,7 +123,7 @@ jobs:
           # Install build-only dependencies  
           sudo apt-get install -yqq --no-install-recommends \
             build-essential \
-            meson \
+            meson \s
             ninja-build