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

@@ -3,7 +3,7 @@ on: [pull_request]
 
 jobs:
   code-quality-linux-x86_64:
-    name: Linux x86_64
+    name: libkrun (Linux x86_64)
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -27,7 +27,7 @@ jobs:
         run: cargo clippy --locked --features net,blk,gpu,snd -- -D warnings
 
   code-quality-linux-aarch64:
-    name: Linux aarch64
+    name: libkrun (Linux aarch64)
     runs-on: ubuntu-24.04-arm
     steps:
       - uses: actions/checkout@v4
@@ -45,7 +45,7 @@ jobs:
         run: cargo clippy --locked --features net,blk,gpu,snd -- -D warnings
 
   code-quality-macos:
-    name: macOS aarch64
+    name: libkrun (macOS aarch64)
     runs-on: macos-latest
     steps:
       - uses: actions/checkout@v4
@@ -58,3 +58,108 @@ jobs:
 
       - name: Clippy (efi+gpu)
         run: cargo clippy --locked --features efi,gpu -- -D warnings
+
+  code-quality-examples:
+    name: ${{ matrix.name }}
+    strategy:
+      matrix:
+        include:
+          - name: "Examples (Linux x86_64)"
+            runner: ubuntu-latest
+          
+          - name: "Examples (Linux aarch64)"
+            runner: ubuntu-24.04-arm
+    runs-on: ${{ matrix.runner }}
+    steps:
+      - uses: actions/checkout@v4
+      
+      - name: Setup build environment
+        uses: ./.github/actions/setup-build-env
+      
+      - name: Cache GLib 2.82 + GTK 4.16 build
+        uses: actions/cache@v4
+        id: gtk-cache
+        with:
+          path: ~/gtk-prefix
+          key: ${{ runner.os }}-${{ runner.arch }}-gtk-4.16.0
+      
+      - name: Install GTK system dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -yqq --no-install-recommends \
+            libffi-dev \
+            libmount-dev \
+            libpcre2-dev \
+            zlib1g-dev \
+            libcairo2-dev \
+            libpango1.0-dev \
+            libgdk-pixbuf-2.0-dev \
+            libgraphene-1.0-dev \
+            libepoxy-dev \
+            libxkbcommon-dev \
+            wayland-protocols \
+            libwayland-dev
+      
+      - name: Add GLib + GTK paths to environment
+        run: |
+          case "$(uname -m)" in
+            x86_64)
+              GTK_PKG_CONFIG_PATH="$HOME/gtk-prefix/lib/x86_64-linux-gnu/pkgconfig"
+              GTK_LIB_PATH="$HOME/gtk-prefix/lib/x86_64-linux-gnu" ;;
+            aarch64)
+              GTK_PKG_CONFIG_PATH="$HOME/gtk-prefix/lib/aarch64-linux-gnu/pkgconfig"
+              GTK_LIB_PATH="$HOME/gtk-prefix/lib/aarch64-linux-gnu" ;;
+            *)
+              echo "ERROR: Unsupported architecture: $(uname -m)"
+              exit 1 ;;
+          esac
+          
+          echo "PKG_CONFIG_PATH=$GTK_PKG_CONFIG_PATH:$PKG_CONFIG_PATH" >> $GITHUB_ENV
+          echo "LD_LIBRARY_PATH=$GTK_LIB_PATH:$LD_LIBRARY_PATH" >> $GITHUB_ENV
+
+      - name: Build and install GTK 4.16 from source
+        if: steps.gtk-cache.outputs.cache-hit != 'true'
+        run: |
+          # Install build-only dependencies  
+          sudo apt-get install -yqq --no-install-recommends \
+            build-essential \
+            meson \
+            ninja-build
+          
+          
+          # Build GLib first
+          cd /tmp
+          curl -L -o glib-2.82.2.tar.xz https://download.gnome.org/sources/glib/2.82/glib-2.82.2.tar.xz
+          tar -xf glib-2.82.2.tar.xz
+          cd glib-2.82.2
+          meson setup builddir --prefix=$HOME/gtk-prefix --buildtype=release
+          meson compile -C builddir
+          meson install -C builddir
+          
+          # Build GTK
+          cd /tmp
+          curl -L -o gtk-4.16.0.tar.xz https://download.gnome.org/sources/gtk/4.16/gtk-4.16.0.tar.xz
+          tar -xf gtk-4.16.0.tar.xz
+          cd gtk-4.16.0
+          meson setup builddir --prefix=$HOME/gtk-prefix --buildtype=release \
+            -Dmedia-gstreamer=disabled \
+            -Dintrospection=disabled \
+            -Dx11-backend=false \
+            -Dprint-cups=disabled \
+            -Dcloudproviders=disabled \
+            -Dtracker=disabled \
+            -Dcolord=disabled \
+            -Dsysprof=disabled \
+            -Dvulkan=disabled
+          meson compile -C builddir
+          meson install -C builddir
+      
+      - name: Build and install libkrun to local prefix
+        run: |
+          mkdir -p $HOME/libkrun-prefix
+          GPU=1 NET=1 INPUT=1 PREFIX=$HOME/libkrun-prefix make && PREFIX=$HOME/libkrun-prefix make install
+      
+      - name: Clippy (examples workspace)
+        run: |
+          cd examples
+          PKG_CONFIG_PATH="$HOME/libkrun-prefix/lib64/pkgconfig:$PKG_CONFIG_PATH" LD_LIBRARY_PATH="$HOME/libkrun-prefix/lib64:$LD_LIBRARY_PATH" cargo clippy --locked -- -D warnings