Replace the C++/Qt application with a Rust + GTK4 port

.github/workflows/appimage.yml

@@ -0,0 +1,23 @@
+name: AppImage (Ubuntu 24.04)
+
+on: [push, pull_request, workflow_dispatch]
+
+permissions:
+  contents: read
+
+jobs:
+  appimage:
+    name: AppImage (Ubuntu 24.04, glibc 2.39, x86_64)
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Build and package
+        run: SRC="$GITHUB_WORKSPACE" OUT="$GITHUB_WORKSPACE/dist" bash packaging/appimage/build.sh
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: QLinuxDeviceManager-AppImage-x86_64-${{ github.sha }}
+          path: dist/*.AppImage
+          if-no-files-found: error
+          retention-days: 14

.github/workflows/rust.yml

@@ -0,0 +1,49 @@
+name: Rust
+
+on: [push, pull_request, workflow_dispatch]
+
+permissions:
+  contents: read
+
+jobs:
+  rust:
+    name: fmt, clippy, test (Ubuntu 24.04)
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends \
+            build-essential pkg-config libgtk-4-dev libudev-dev libkmod-dev libdisplay-info-dev \
+            libv4l-dev libwayland-dev libxcb-randr0-dev clang libclang-dev gettext desktop-file-utils \
+            xvfb at-spi2-core
+
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt, clippy
+
+      - uses: Swatinem/rust-cache@v2
+
+      - name: Format
+        run: cargo fmt --all --check
+
+      - name: Clippy
+        run: cargo clippy --workspace --all-targets --locked -- -D warnings
+
+      - name: Unit and integration tests
+        run: cargo test --workspace --locked --exclude qldm-gtk
+
+      # The UI smoke test needs a display; xvfb provides an X11 one.
+      - name: UI smoke test
+        run: xvfb-run -a cargo test -p qldm-gtk --locked --test ui_smoke
+
+      - name: Desktop entry and message catalogue
+        run: |
+          desktop-file-validate packaging/io.github.birdie-github.QLinuxDeviceManager.desktop
+          po/update-pot.sh
+          git diff --exit-code -I POT-Creation-Date po/qlinuxdevicemanager.pot
+
+      - name: Install into a staging directory
+        run: make install PREFIX=/usr DESTDIR="$PWD/stage"

.gitignore

@@ -7,3 +7,7 @@ BUILD/
 *.patch
 *.diff
 .directory
+executable_graph.k.json
+/target
+dist/
+/target-appimage