refactor: Simplify some commands in kafka cdc example. (#8910)

integration_tests/kafka-cdc-sink/Makefile.toml

@@ -18,32 +18,13 @@ dependencies = ["start-cluster"]
 
 [tasks.setup-pg]
 script = """
-docker run \
-    --network risingwave-compose_default \
-    -v ./:/tmp/ \
-    --env PGPASSWORD=123456 \
-    postgres:14.7 \
-    psql \
-    -h postgres \
-    -p 5432 \
-    -d mydb \
-    -U myuser \
-    -f /tmp/pg.sql
+PGPASSWORD=123456 psql -h localhost -p 5432 -d mydb -U myuser -f pg.sql
 """
 dependencies = ["start-cluster"]
 
 [tasks.setup-risingwave]
 script = """
-docker run \
-    --network risingwave-compose_default \
-    -v ./:/tmp/ \
-    postgres:14.7 \
-    psql \
-    -h frontend-node-0 \
-    -p 4566 \
-    -d dev \
-    -U root \
-    -f /tmp/risingwave.sql
+psql -h localhost -p 4566 -d dev -U root -f risingwave.sql
 """
 dependencies = ["setup-kafka"]