ci: replaced python_version matrix var with `python-version-file: p…

.github/workflows/build.yml

@@ -8,29 +8,29 @@ on:
 
 jobs:
   build:
-    name: Test on ${{ matrix.os }} (py-${{ matrix.python_version }})
+    name: Test on ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
         os: [ubuntu-20.04, windows-latest, macOS-11]
-        python_version: [3.9]
     steps:
     - uses: actions/checkout@v2
       with:
         submodules: 'recursive'
     - name: Set up Python
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v4
       with:
-        python-version: ${{ matrix.python_version }}
+        python-version-file: pyproject.toml
+        cache: 'poetry'
     - name: Create virtualenv
       shell: bash
       run: |
         python -m venv venv
     - name: Install dependencies
       shell: bash
       run: |
-        pip install poetry==1.3.2  # due to: https://github.com/python-poetry/poetry/issues/7611
+        pipx install poetry==1.3.2  # due to: https://github.com/python-poetry/poetry/issues/7611
         source venv/bin/activate || source venv/Scripts/activate
         poetry install
     - name: Run tests
@@ -50,5 +50,5 @@ jobs:
     - name: Upload package
       uses: actions/upload-artifact@v2
       with:
-        name: aw-watcher-afk-${{ runner.os }}-py${{ matrix.python_version }}
+        name: aw-watcher-afk-${{ runner.os }}
         path: dist/aw-watcher-afk