Assure ansible has docker_container module installed (#26)

We need ansible with docker module for using this module.

Author: ssbarnea

.github/workflows/tox.yml

@@ -40,6 +40,11 @@ jobs:
 
     steps:
       - uses: actions/checkout@v1
+      - name: Install system dependencies
+        run: |
+          sudo apt-get update \
+          && sudo apt-get install -y  ansible \
+          && ansible-doc -l | grep docker_container
       - name: Find python version
         id: py_ver
         shell: python

tox.ini

@@ -37,8 +37,8 @@ setenv =
     MOLECULE_NO_LOG=0
 deps =
     devel: ansible>=2.10.0a2,<2.11
-    py{36,37,38}: molecule[test]
-    py{36,37,38}-{devel}: git+https://github.com/ansible-community/molecule.git@master#egg=molecule[test]
+    py{36,37,38,39}: molecule[test]
+    py{36,37,38,39}-{devel}: git+https://github.com/ansible-community/molecule.git@master#egg=molecule[test]
     dockerfile: ansible>=2.9.12
     selinux
 extras =