fix(superset): restore ClickHouse dialect and dataset metadata sync

- switch Superset ClickHouse URI back to clickhousedb://\n- refresh dataset metadata during init to restore filter columns\n- install runtime deps in image layer and add troubleshooting notes

Dockerfile.superset

@@ -6,6 +6,6 @@ RUN apt-get update && \
     apt-get install -y bind9-host bat less iputils-ping curl postgresql-client && \
     apt-get clean
 
-USER superset
+RUN pip install --no-cache-dir clickhouse-connect==0.8.* psycopg2-binary==2.9.*
 
-RUN pip install clickhouse-connect==0.8.* clickhouse-sqlalchemy==0.3.* psycopg2-binary==2.9.*
+USER superset