Create CI for packaging

.github/workflows/python-app.yml

@@ -0,0 +1,39 @@
+# This workflow will install Python dependencies, run tests and lint with a single version of Python
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python
+
+name: Python application
+
+on:
+  push:
+    branches: [ "obs", "firefox" ]
+  pull_request:
+    branches: [ "obs", "firefox" ]
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python 3.10
+      uses: actions/setup-python@v3
+      with:
+        python-version: "3.10"
+    - name: Install dependencies
+      run: |
+        bash install_prereq_ubuntu.sh
+    - name: Package an app
+      run: |
+        mkdir /out/
+        python build_a_pkg.py
+    - name: Test with pytest
+      uses: actions/upload-artifact@v4.4.3
+      with:
+          # Artifact name
+          name: artifact.pkg
+          # A file, directory or wildcard pattern that describes what to upload
+          path: /out/*.pkg