FEAT(multi-arch): add support for multi arch

gitlab-ci builds now for armv7, arm64v8 and amd64

.gitlab-ci.yml

 image: python:3.9
+variables:
+  DOCKER_HOST: tcp://docker:2375/
 
 stages:
   - test
@@ -62,7 +64,6 @@ docker-push:
   variables:
     # the name of the image without version
     AURA_IMAGE_NAME: "autoradio/engine-recorder"
-    DOCKER_HOST: tcp://docker:2375/
   services:
     - docker:dind
   before_script: