Track workers endpoint list in repo instead of regenerating on user side

roles/matrix-synapse/files/workers-doc-to-yaml.sh

@@ -0,0 +1,6 @@
+#!/bin/sh
+# Fetch the synapse worker documentation and extract endpoint URLs
+# matrix-org/synapse master branch points to current stable release
+
+URL=https://github.com/matrix-org/synapse/raw/master/docs/workers.md
+curl -L ${URL} | awk -f workers-doc-to-yaml.awk > ../vars/workers.yml