Trigger Pull Request on master Branch Only

Build Environment
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1

Hello, I have the following config:

version: 2.1

orbs:
  node: circleci/node@2.0.3

jobs:
  build-and-test:
    executor:
      name: node/default

    steps:
      - checkout
      - restore_cache:
          name: Restore Yarn Package Cache
          keys:
            - yarn-packages-{{ checksum "yarn.lock" }}
      - run:
          name: Install Dependencies
          command: yarn install --frozen-lockfile
      - save_cache:
          name: Save Yarn Package Cache
          key: yarn-packages-{{ checksum "yarn.lock" }}
          paths:
            - ~/.cache/yarn

      - run:
          name: Build Pages
          command: yarn build:login

  build-and-deploy:
    executor:
      name: node/default

    steps:
      - checkout

      - run:
          name: Install Dependencies
          command: yarn install --frozen-lockfile

      - run:
          name: Build Pages
          command: yarn build:login

      - run:
          name: Deploy to Auth0
          command: VERSION=$(node -p "'my-package@' + require('./package.json').version") yarn deploy

workflows:
  build-and-test:
    jobs:
      - build-and-test

  build-and-deploy-staging:
    jobs:
      - build-and-deploy:
          context: my-package-staging
          filters:
            branches:
              only: next

  build-and-deploy-production:
    jobs:
      - build-and-deploy:
          context: my-package-production
          filters:
            tags:
              only: /^v.*/

I would like to run the build-and-test job only when developers create a pull request on the master branch. Any idea how I can do this?