Add CI

.gitlab-ci.yml

+stages:
+  - test
+
+lint:
+  stage: test
+  image: homeassistant/amd64-homeassistant
+  before_script:
+    - mkdir -p /home/pi/ssl
+    - touch /home/pi/ssl/chain
+    - touch /home/pi/ssl/key
+  script:
+    - hass --script check_config -c .