remove duplicate gitlab ci job file

.gitlab-ci.yaml

-image: golang:1.14
-
-stages:
-  - prepare
-  - test
-  - build
-
-variables:
-  GOPATH: ${CI_PROJECT_DIR}/.go
-
-before_script:
-  - mkdir -p .go
-  - go get -u github.com/onsi/ginkgo/ginkgo
-  - go get -u golang.org/x/lint/golint
-
-.cache:
-  cache:
-    key: ${CI_COMMIT_REF_SLUG}
-    paths: 
-      - .go/
-
-lint_code:
-  stage: prepare
-  script:
-    - .go/bin/golint -set_exit_status $(go list ./... | grep -v /vendor/)
-  extends: .cache
-
-unit_tests:
-  stage: test
-  script:
-    - mkdir coverage
-    - .go/bin/go test ./... -coverprofile cover.out
-  extends: .cache
-
-build_all:
-  stage: build
-  script:
-    - CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -installsuffix cgo ./...
-  extends: .cache