Add arm64 Docker guild tests

Author: NeonDaniel

.github/workflows/unit_tests.yml

@@ -15,6 +15,8 @@ jobs:
       python_version: "3.8"
   docker_build_tests:
     uses: neongeckocom/.github/.github/workflows/docker_build_tests.yml@master
+    with:
+      platforms: linux/amd64,linux/arm64
   unit_tests:
     timeout-minutes: 15
     strategy:
@@ -51,4 +53,4 @@ jobs:
         uses: actions/upload-artifact@v2
         with:
           name: gui-service-test-results
-          path: tests/gui-service-test-results.xml
+          path: tests/gui-service-test-results.xml