actions: pack for Linux

Author: clstaudt

.github/workflows/pack-app.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: ["macos-latest", "windows-latest"]
+        os: ["macos-latest", "windows-latest", "ubuntu-latest"]
 
     steps:
     - uses: actions/checkout@main