Update CI workflow for poetry

This also adds pytest and flake8 to DEV deps since they are needed for CI.

.github/workflows/python-app.yml

@@ -1,48 +1,51 @@
 # This workflow will install Python dependencies, run tests and lint with a single version of Python
-# For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions
 
-name: Python application
+name: Python CI
 
 on:
   push:
-    branches: [ master ]
+    branches: [master]
   pull_request:
-    branches: [ master ]
+    branches: [master]
 
 jobs:
-  build:
-
-    runs-on: ubuntu-22.04
-
+  ci:
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.12"]
+        os: [ubuntu-22.04]
+    runs-on: ${{matrix.os}}
     steps:
       - uses: actions/checkout@v4
-      - name: Set up Python 3.10
+      - name: Install Python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.10'
-      - name: Cache pip
+          python-version: ${{matrix.python-version}}
+      - name: Install Poetry
+        uses: abatilo/actions-poetry@v2
+      - name: Set up local virtual environment
+        run: |
+          poetry config virtualenvs.create true --local
+          poetry config virtualenvs.in-project true --local
+      - name: Cache packages
         uses: actions/cache@v4
         with:
           # This path is specific to ubuntu
-          path: ~/.cache/pip
-          key: ${{ runner.os }}-pip-${{ hashFiles('requirements.txt') }}
-          restore-keys: |
-            ${{ runner.os }}-pip-
-            ${{ runner.os }}-
+          path: ./.venv
+          key: venv-${{ hashFiles('poetry.lock') }}
       - name: Install dependencies
         run: |
           sudo apt install qt6-base-dev libsystemd-dev gcc
-          python -m pip install --upgrade pip
-          pip install flake8 pytest
-          if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+          poetry install
       - name: Compile ui, translations and resources
-        run: ./scripts/build_ui.sh
+        run: poetry run ./scripts/build_ui.sh
       - name: Lint with flake8
         run: |
           # stop the build if there are Python syntax errors or undefined names
-          flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+          poetry run flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
           # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-          flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+          poetry run flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
       - name: Test with pytest
         run: |
-          pytest
+          poetry run pytest -v