add linux workflow

.github/workflows/linux.yml

@@ -0,0 +1,23 @@
+name: Build Linux
+run-name: Build Linux
+on:
+  workflow_dispatch: {}
+jobs:
+  Build_Deb:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: subosito/flutter-action@v2
+      with:
+        channel: 'stable'
+        architecture: x64
+    - run: |
+        sudo apt-get update -y
+        sudo apt-get install -y ninja-build libgtk-3-dev
+        dart pub global activate flutter_to_debian
+    - run: python3 debian/build.py
+    - uses: actions/upload-artifact@v3
+      with:
+        name: deb_build
+        path: build/linux/x64/release/debian
+