when running step in pipeline, bitbucket would load a default docker image, may i know can we create our own image, because we need to install lots of third party package, it would take lots of time for default docker image
They're just Docker images - you should be able to create your own with standard Docker tools. Docker has some documentation at https://docs.docker.com/get-started/ to learn how to create images.
There is some more detailed, Pipelines-specific, documentation at https://confluence.atlassian.com/bitbucket/use-docker-images-as-build-environments-792298897.html as well.
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