Apt-get: not found in postman/newman image

I’m using postman/newman image for my bitbucket pipelines.!

Below is the sample pipeline definition.! And i’m getting apt-get: not found.! Why this image not supporting to apt-get?
i also tried to install jq by apt-get install -y jq but getting jq: not found. Any helps?

      - step: &regression_test_api
          image: postman/newman
          name: API test suite
            - apt-get update
            - apt-get install -y jq
            - newman --version