Add transmission-rpc.

For programmatically managing Transmissions using Python. Exciting.

Dockerfile

@@ -222,6 +222,7 @@ RUN apt-get update && \
         template \
         todoman \
         tox \
+        transmission-rpc \
     && \
     echo pdm-publish pdm-version | xargs -n1 pdm plugin add && \
     export GOPATH=/usr/local/lib/go && \