added version

Author: chernser

.github/workflows/run_examples.yml

@@ -60,7 +60,7 @@ jobs:
             key: ${{ github.run_id  }}-ch-artifacts
       - name: Run Examples
         run: |
-          docker run -d --name demo-service-db -e CLICKHOUSE_USER=default -e CLICKHOUSE_DEFAULT_ACCESS_MANAGEMENT=1 -e CLICKHOUSE_PASSWORD=secret -p 8123:8123 clickhouse/clickhouse-server:${$PREFERRED_LTS_VERSION}
+          docker run -d --name demo-service-db -e CLICKHOUSE_USER=default -e CLICKHOUSE_DEFAULT_ACCESS_MANAGEMENT=1 -e CLICKHOUSE_PASSWORD=secret -p 8123:8123 clickhouse/clickhouse-server:${PREFERRED_LTS_VERSION}
           cd examples/jdbc
           mvn --batch-mode --no-transfer-progress --show-version clean compile
           mvn exec:java -Dexec.mainClass="com.clickhouse.examples.jdbc.Basic" -DchPassword=secret -DfailOnError=true