Chore: move tests to github actions

 - disable tests for Ansible 2.8 (we use 2.9)
 - disable tests for Python version we don't use

.github/workflows/ci.yml

@@ -0,0 +1,19 @@
+---
+name: ci
+
+on:
+  pull_request
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+        with:
+          # this should be in sync with our deploy image
+          python-version: "3.7.x"
+      - run: |
+          python -m pip install --upgrade pip
+          pip install tox tox-gh-actions
+      - run: tox

tox.ini

@@ -1,14 +1,17 @@
 [tox]
 minversion = 1.8
-envlist = py{37,38}-ansible{28,29}-swarm-{centos,ubuntu}
+envlist = py{37}-ansible{29}-swarm-{centos,ubuntu}
 skipsdist = true
 
+[gh-actions]
+python =
+    3.7: py37
+
 [testenv]
 passenv = *
 deps =
     -rtest-requirements.txt
-    ansible29: ansible<3.0
-    ansible28: ansible<2.9
+    ansible29: ansible<2.10
 commands =
     centos: {posargs:molecule test -s swarm-centos --destroy always}
     ubuntu: {posargs:molecule test -s swarm-ubuntu --destroy always}