add workflow: tests

Author: aryaniyaps

.github/stale.yml renamed to .github/workflows/stale.yml

@@ -0,0 +1,85 @@
+name: 📄 Tests
+on:
+  push:
+    branches:
+      - master
+      - '*.x'
+    paths-ignore:
+      - 'docs/**'
+      - '*.md'
+      - '*.rst'
+  pull_request:
+    branches:
+      - master
+      - '*.x'
+    paths-ignore:
+      - 'docs/**'
+      - '*.md'
+      - '*.rst'
+jobs:
+  tests:
+    # runs the test suite
+    name: ${{ matrix.name }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - {name: '3.8', python: '3.8', os: ubuntu-latest, tox: py38}
+          - {name: '3.7', python: '3.7', os: ubuntu-latest, tox: py37}
+          - {name: '3.6', python: '3.6', os: ubuntu-latest, tox: py36}
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python }}
+
+      - name: update pip
+        run: |
+          pip install -U wheel
+          pip install -U setuptools
+          python -m pip install -U pip
+
+      - name: get pip cache dir
+        id: pip-cache
+        run: echo "::set-output name=dir::$(pip cache dir)"
+
+      - name: cache pip
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.pip-cache.outputs.dir }}
+          key: pip|${{ runner.os }}|${{ matrix.python }}|${{ hashFiles('setup.py') }}
+
+      - run: pip install tox
+      - run: tox -e ${{ matrix.tox }}
+
+  coveralls:
+    # check coverage increase/decrease
+    needs: tests
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Coveralls Finished
+        uses: AndreMiras/coveralls-python-action@develop
+        with:
+          parallel-finished: true
+
+  deploy:
+    # builds and publishes to PyPi
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: '3.7'
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install build
+      - name: Build package
+        run: python -m build
+      - name: Publish package
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          user: __token__
+          password: ${{ secrets.PYPI_API_TOKEN }}