Add CI for PRs and CD for default branch

.github/workflows/ci.yaml

@@ -0,0 +1,41 @@
+---
+name: CI
+on:
+  pull_request:
+    types: ["opened", "synchronize"]
+  push:
+    branches: ["devel"]
+jobs:
+  Test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python:
+          - version: 3.6
+            toxenv: py36
+          - version: 3.7
+            toxenv: py37
+          - version: 3.8
+            toxenv: py38
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python ${{ matrix.python.version }}
+        uses: actions/setup-python@v1
+        with:
+          python-version: ${{ matrix.python.version }}
+      - name: Install tox
+        run: pip install "tox>=3.20.0,<3.21.0" --upgrade
+      - name: Run tests via ${{ matrix.python.toxenv }}
+        run: tox -e ${{ matrix.python.toxenv }}
+  Check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python 3.8
+        uses: actions/setup-python@v1
+        with:
+          python-version: 3.8
+      - name: Install tox requirements
+        run: pip install "tox>=3.20.0,<3.21.0" --upgrade
+      - name: Run meta checks
+        run: tox -e static -e static-tests -e security