Add Github Actions to run unit tests

.github/workflows/testing.yml

@@ -0,0 +1,16 @@
+name: Unit Testing ufw-docker
+on: [push, pull_request]
+jobs:
+  test:
+    name: Unit Testing
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Checkout submodules
+      shell: bash
+      run: |
+        auth_header="$(git config --local --get http.https://github.com/.extraheader)"
+        git submodule sync --recursive
+        git -c "http.extraheader=$auth_header" -c protocol.version=2 submodule update --init --force --recursive --depth=1
+    - name: Test ufw-docker
+      run: ./test.sh