adding untested changes and new dockers

social/matrix/.env.example

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+# Synapse homeserver domain (cannot be changed after federation starts)
+SYNAPSE_SERVER_NAME=matrix.example.com
+
+TZ=UTC
+
+# LiveKit JWT service credentials
+# Generate a key/secret pair: https://docs.livekit.io/home/self-hosting/deployment/
+LIVEKIT_KEY=changeme
+LIVEKIT_SECRET=changeme
+
+# Optional: override if livekit is not on localhost
+# LIVEKIT_URL=ws://localhost:7880