ci: add AppImage build job to release workflow

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.github/workflows/release.yml

@@ -54,6 +54,62 @@ jobs:
         run: |
           gh release upload ${{ github.ref_name }} H7CAD.flatpak --clobber --repo ${{ github.repository }}
 
+  build-appimage:
+    runs-on: ubuntu-22.04
+    permissions:
+      contents: write
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Install dependencies
+        run: |
+          sudo apt-get update -q
+          sudo apt-get install -y \
+            libgl1-mesa-dev libx11-dev libxcursor-dev libxi-dev libxrandr-dev \
+            libxkbcommon-dev libwayland-dev libfontconfig1-dev libfreetype6-dev \
+            librsvg2-bin fuse libfuse2
+
+      - name: Build
+        run: cargo build --release
+
+      - name: Prepare AppDir
+        run: |
+          mkdir -p AppDir/usr/bin
+          mkdir -p AppDir/usr/share/applications
+          mkdir -p AppDir/usr/share/icons/hicolor/256x256/apps
+          cp target/release/H7CAD AppDir/usr/bin/H7CAD
+          cp flatpak/io.github.HakanSeven12.H7CAD.desktop AppDir/usr/share/applications/
+          rsvg-convert -w 256 -h 256 assets/logo.svg \
+            -o AppDir/usr/share/icons/hicolor/256x256/apps/io.github.HakanSeven12.H7CAD.png
+
+      - name: Download linuxdeploy
+        run: |
+          wget -q https://github.com/linuxdeploy/linuxdeploy/releases/download/continuous/linuxdeploy-x86_64.AppImage
+          chmod +x linuxdeploy-x86_64.AppImage
+
+      - name: Build AppImage
+        env:
+          APPIMAGE_EXTRACT_AND_RUN: 1
+        run: |
+          ./linuxdeploy-x86_64.AppImage \
+            --appdir AppDir \
+            --desktop-file flatpak/io.github.HakanSeven12.H7CAD.desktop \
+            --icon-file AppDir/usr/share/icons/hicolor/256x256/apps/io.github.HakanSeven12.H7CAD.png \
+            --output appimage
+          mv H7CAD*.AppImage H7CAD.AppImage
+
+      - name: Upload AppImage to release
+        if: github.event_name == 'release'
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          gh release upload ${{ github.ref_name }} H7CAD.AppImage --clobber --repo ${{ github.repository }}
+
   build-windows:
     runs-on: windows-latest
     permissions: