What about port? What if I have PostgreSQL already running on my machine? Or what if I run two builds in parallel? They will collapse. We should use:

```
<plugin>
  <groupId>org.codehaus.mojo</groupId>
  <artifactId>build-helper-maven-plugin</artifactId>
  <version>1.8</version>
  <executions>
    <execution>
      <goals>
        <goal>reserve-network-port</goal>
      </goals>
      <configuration>
        <portNames>
          <portName>pgsql.port</portName>
        </portNames>
      </configuration>
    </execution>
  </executions>
</plugin>
```

And then use this `${pgsql.port}` for postgresql instance