Drop github workflows as part of retirement.

Change-Id: I46a784c195de4f7cc650cac98360ab9f80620fd7

.github/workflows/tox.yaml

@@ -1,29 +0,0 @@
-name: Python package
-
-on:
-  - push
-  - pull_request
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        python-version:
-          - "3.8"
-          - "3.9"
-          - "3.10"
-    steps:
-    - uses: actions/checkout@v1
-    - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
-      with:
-        python-version: ${{ matrix.python-version }}
-    - name: Install dependencies
-      run: |
-        python -m pip install --upgrade pip
-        pip install tox tox-gh-actions
-    - name: Lint with tox
-      run: tox -e pep8
-    - name: Test with tox
-      run: tox -e py${{ matrix.python-version }}