test: Add with-config and change-to-non-root-user test scenarios

Also run test scenarios in parallel on GitHub Actions.

.github/workflows/ci.yml

@@ -8,7 +8,11 @@ jobs:
     strategy:
       max-parallel: 4
       matrix:
-        python-version: [2.7, 3.6, 3.7]
+        python-version: [3.6, 3.7]
+        scenario:
+          - default
+          - with-config
+          - change-to-non-root-user
     steps:
       - uses: actions/checkout@v1
       - name: Set up Python ${{ matrix.python-version }}
@@ -17,9 +21,9 @@ jobs:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies
         run: |
-          sudo apt install docker
+          sudo apt-get install -y docker
           python -m pip install --upgrade pip
           pip install -r requirements.txt
       - name: Test with molecule
         run: |
-          molecule test --all
+          molecule test -s ${{ matrix.scenario }}