Use new CI templates

.gitlab-ci.yml

+include: "https://git.autistici.org/ai3/docker/test/golang/raw/master/ci.yml"
+
 stages:
   - test
 
-run_tests:
-  stage: test
-  image: registry.git.autistici.org/ai3/docker/test/golang:master
-  script:
-    - run-go-test ./...
-  artifacts:
-    when: always
-    reports:
-      coverage_report:
-        coverage_format: cobertura
-        path: cover.xml
-      junit: report.xml
-