Simple Gitlab CI, deploy AWS Lambda using Serverless framework

.gitlab-ci.yml

image: node:latest
stages:
    - deploy

Production:
    stage: deploy
    only:
        refs:
            - master
    before_script:
        - npm config set prefix /usr/local
        - npm install -g serverless@1.83.0
    script:
        - npm i
        - serverless deploy --stage prod --verbose
    environment: Production
    when: manual

serverless.yml

service:
  name: my-service-name

provider:
  name: aws
  runtime: nodejs12.x
  stage: ${opt:stage,'dev'}
  region: us-east-1
  versionFunctions: false

custom:
  objectPrefix: "${self:service}-${self:provider.stage}"

functions:
  lambdaName:
    handler: myLambdaFileName.handler
    memorySize: 128
    timeout: 5