CI: add clnrest requirements so --help lists rest params.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

.github/workflows/ci.yaml

@@ -51,6 +51,8 @@ jobs:
           # Export and then use pip to install into the current env
           poetry export -o /tmp/requirements.txt --without-hashes --with dev
           pip install -r /tmp/requirements.txt
+          # Make sure we have clnrest requirements, for check-manpages
+          pip install -r plugins/clnrest/requirements.txt
           # We're going to check BOLT quotes, so get the latest version
           git clone https://github.com/lightning/bolts.git ../${BOLTDIR}
       - name: Configure