Yarn Bash completion.

Dockerfile

@@ -282,6 +282,7 @@ RUN apt-get update && \
     wget https://raw.githubusercontent.com/docker/compose/1.29.2/contrib/completion/bash/docker-compose -qO /etc/bash_completion.d/docker-compose && \
     wget https://raw.githubusercontent.com/ansible-community/molecule/1.25.1/asset/bash_completion/molecule.bash-completion.sh -qO /etc/bash_completion.d/molecule && \
     wget https://github.com/mrolli/packer-bash-completion/raw/master/packer -qO /etc/bash_completion.d/packer && \
+    wget https://raw.githubusercontent.com/dsifford/yarn-completion/v0.17.0/yarn-completion.bash -qO /etc/bash_completion.d/yarn && \
     git clone https://github.com/asdf-vm/asdf.git /opt/asdf && \
     ln --symbolic --target /etc/profile.d/ /opt/asdf/asdf.sh && \
     ln --symbolic /opt/asdf/completions/asdf.bash /etc/bash_completion.d/asdf && \