Open Code Ocean's custom package management system. Next, use apt-get to install build-essential . Then, in a setup script, use the command curl -fsS https://dlang.org/install.sh | bash -s install ldc-1.6.0  to install dlang. 

See the following two examples for more specific usage demonstrations:

https://codeocean.com/2018/01/04/d-lpar-dlang-rpar-hello-world/code
https://codeocean.com/2018/01/04/vectorflow-mnist-example-lpar-dlang-dub-rpar/code
Note that the second example also installs supplementary D libraries via the setup script.
 

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