CI: add linux appimage action

.github/workflows/build.yml

@@ -0,0 +1,42 @@
+name: Build eismuliplexer for linux
+run-name: Building eismuliplexer for linux
+on: [push]
+
+jobs:
+  Build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install dependancies
+        run: sudo apt update; sudo apt install -y libusb-1.0-0-dev cmake qt6-base-dev qt6-base-dev-tools qt6-tools-dev-tools libqt6widgets6 libqt6multimedia6 qt6-multimedia-dev ffmpeg wget libglx-dev libgl1-mesa-dev qt6-qpa-plugins
+      - name: Check out repository code
+        uses: actions/checkout@v6
+      - name: Install Appimagetool
+        run: |
+            wget -c https://github.com/$(wget -q https://github.com/probonopd/go-appimage/releases/expanded_assets/continuous -O - | grep "appimagetool-.*-x86_64.AppImage" | head -n 1 | cut -d '"' -f 2)
+            chmod +x appimagetool-*-x86_64.AppImage
+            sudo mv appimagetool-*-x86_64.AppImage /usr/bin/appimagetool
+      - name: Version
+        id: version
+        run: |
+            cd ${{ github.workspace }}
+            git fetch -a;
+            echo "tag=$(git describe --tags `git rev-list --tags --max-count=1`)" >> $GITHUB_OUTPUT
+      - name: Build
+        run: |
+            mkdir ${{ github.workspace }}/build; cd ${{ github.workspace }}/build
+            cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=./install/usr -DGIT_TAG=${{ steps.version.outputs.tag }} ..
+            make -j $(nproc)
+            make install
+      - name: Create Appimage
+        run: |
+            cd ${{ github.workspace }}/build/
+            install -d install/usr/lib/x86_64-linux-gnu/qt6/plugins/multimedia
+            cp -vr /lib/x86_64-linux-gnu/qt6/plugins/multimedia/libffmpegmediaplugin.so install/usr/lib/x86_64-linux-gnu/qt6/plugins/multimedia/
+            appimagetool --appimage-extract-and-run -s deploy install/usr/share/applications/xyz.uvos.aceradio.desktop
+            appimagetool --appimage-extract-and-run -s install
+      - name: Upload Appimage
+        uses: actions/upload-artifact@v6
+        with:
+            name: aceradio-appimage
+            path: ${{ github.workspace }}/build/*.AppImage
+