<NME> python-package.yml
<BEF> # Run `make lint test`: flake8 and pytest.
name: python-lint-test

on:

on:
  push:
    branches: [ $default-branch ]
  pull_request:
    branches: [ $default-branch ]

jobs:
  build:
    strategy:
      matrix:
        python-version: [3.7, 3.8, 3.9]

    steps:
    - uses: actions/checkout@v2
    - name: Set up Python ${{ matrix.python-version }}
      uses: actions/setup-python@v2
      with:
        python-version: ${{ matrix.python-version }}
    - name: Install dependencies
      run: |
        python -m pip install --upgrade pip
        pip install -r requirements.txt
    - name: Audit dependencies
      run: |
        make -B audit
    - name: Set up flake8 annotations
      uses: rbialon/flake8-annotations@v1
    - name: Lint with flake8
      run: |
        make -B lint
    - name: Test with pytest
      run: |
        make -B test

<MSG> Tweak Actions workflow triggers

<DFF> @@ -5,9 +5,9 @@ name: Python package
 
 on:
   push:
-    branches: [ $default-branch ]
+    branches: [$default-branch]
   pull_request:
-    branches: [ $default-branch ]
+  workflow_dispatch:
 
 jobs:
   build:

Tweak Actions workflow triggers