Variable isn't evaluated, use common path

files/Makefile

@@ -28,10 +28,10 @@ dep:
 	@go get -v ./...
 
 build: dep
-	@gox -output="${CI_PROJECT_DIR}/${CI_PROJECT_NAME}/{{.Dir}}_{{.OS}}_{{.Arch}}" -parallel=6 -osarch '!darwin/386'
+	@gox -output="${CI_PROJECT_DIR}/build/{{.Dir}}_{{.OS}}_{{.Arch}}" -parallel=6 -osarch '!darwin/386'
 
 clean:
-	@rm -rf "${CI_PROJECT_DIR}/${CI_PROJECT_NAME}"
+	@rm -rf "${CI_PROJECT_DIR}/build/"
 
 help:
 	@grep -h -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}'

files/templates/matrix.yml

@@ -36,4 +36,4 @@ build:
     - make
   artifacts:
     paths:
-      - $CI_PROJECT_NAME
+      - build