Merge branch 'run-against-go-1-15' into 'master'

Run CI against Go 1.15 NO CHANGELOG

See merge request gitlab-org/gitlab-workhorse!674

.gitlab-ci.yml

@@ -49,6 +49,10 @@ test using go 1.14:
   extends: .test
   image: golang:1.14
 
+test using go 1.15:
+  extends: .test
+  image: golang:1.15
+
 test:release:
   rules:
     - if: '$CI_COMMIT_TAG'