ci: generate code coverage while running tests

.gitlab-ci.yml

@@ -9,7 +9,15 @@ test:
   stage: test
   image: golang:alpine
   script:
-    - go test ./... -v
+    - go mod download
+    - go test ./... -v -coverprofile=coverage.txt -covermode count
+    - go get github.com/boumenot/gocover-cobertura
+    - go run github.com/boumenot/gocover-cobertura < coverage.txt > coverage.xml
+  artifacts:
+    reports:
+      coverage_report:
+        coverage_format: cobertura
+        path: coverage.xml
 
 build:
   stage: build