Add documentation for Bitbucket Pipelines

docs/supported_docker_environment/continuous_integration/bitbucket_pipelines.md

@@ -0,0 +1,26 @@
+# Bitbucket Pipelines
+
+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](../../features/configuration.md#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:
+
+```yml
+image: maven:3.6.1
+
+pipelines:
+  default:
+    - step:
+        script:
+          - export TESTCONTAINERS_RYUK_DISABLED=true
+          - mvn clean install
+        services:
+          - docker
+definitions:
+  services:
+    docker:
+      memory: 2048
+```

mkdocs.yml

@@ -70,6 +70,7 @@ nav:
                 - supported_docker_environment/continuous_integration/dind_patterns.md
                 - supported_docker_environment/continuous_integration/circle_ci.md
                 - supported_docker_environment/continuous_integration/gitlab_ci.md
+                - supported_docker_environment/continuous_integration/bitbucket_pipelines.md
           - supported_docker_environment/windows.md
           - supported_docker_environment/logging_config.md
     - Getting help: getting_help.md