Add workflow to build the appimage

.github/workflows/build-appimage.yaml

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+name: Build appimage
+
+# Controls when the workflow will run
+on:
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  build:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+    # container: 
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+      - name: Check out repository
+        run: git clone https://github.com/christofsteel/syng /syng
+      - name: Extract version from Poetry
+        id: get_version
+        run: cd /syng && echo "VERSION=$(poetry version -s)" >> $GITHUB_ENV
+        shell: bash
+      - name: Preparing Build dir
+        run: |
+          mkdir /app
+          mkdir /app/bin          
+          cp /syng/resources/appimage/build.sh /app/build.sh
+          cp /syng/resources/appimage/bin/* /app/bin/
+      - name: Building AppDir
+        uses: addnab/docker-run-action@v3
+        with:
+          image: ghcr.io/christofsteel/syng-appimage-builder:main 
+          options: -v /app:/app
+          run: |
+            /app/build.sh 
+            export APPIMAGE_EXTRACT_AND_RUN=1
+            /app/linuxdeploy-x86_64.AppImage --plugin qt --appdir /app/AppDir --output appimage
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: Syng Version ${{ env.VERSION }} AppImage
+          path: /app/Syng-x86_64.AppImage