To enable access to Docker in Bitbucket Pipelines, you need to add
docker as a service on the step.
Furthermore, Ryuk needs to be turned off since Bitbucket Pipelines does not allow starting privileged containers (see Disabling Ryuk). This can either be done by setting a repository variable in Bitbucket's project settings or by explicitly exporting the variable on a step.
In some cases the memory available to Docker needs to be increased.
Here is a sample Bitbucket Pipeline configuration that does a checkout of a project and runs maven:
image: maven:3.6.1 pipelines: default: - step: script: - export TESTCONTAINERS_RYUK_DISABLED=true - mvn clean install services: - docker definitions: services: docker: memory: 2048