enhancement: add github actions configuration file

Add github actions (gh) configuration file and update tox.ini to add
gh related configurations.

.github/workflows/tests.yml

@@ -0,0 +1,31 @@
+---
+# .. seealso:: https://github.com/ymyzk/tox-gh-actions
+#
+name: Tests
+# yamllint disable-line rule:truthy
+on:
+  - push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      max-parallel: 10
+      matrix:
+        python-version:
+          - 2.7
+          - 3.6
+          - 3.7
+          - 3.8
+
+    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: pip install tox tox-gh-actions
+      - name: Test with tox
+        run: tox
+
+# vim:sw=2:ts=2:et:

tox.ini

@@ -2,6 +2,13 @@
 envlist = py27, py34, py35, py36, py37, py38, nightly
 minversion = 3.15
 
+[gh-actions]
+python =
+    2.7: py27
+    3.6: py36
+    3.7: py37
+    3.8: py38
+
 [base]
 commands =
     - /bin/sh -c 'yamllint -c {toxinidir}/yamllint/conf/default.yaml --strict `git ls-files \*.yaml \*.yml`'