how to source a file in maven

I have a shell script that I want maven to source. I specifically want maven to source the file (source run.sh) rather than just executing it (./run.sh)

I have tried 2 different approaches with 2 different plugins and neither work:

<plugin>
  <artifactId>exec-maven-plugin</artifactId>
  <groupId>org.codehaus.mojo</groupId>
  <executions>
    <execution>
      <id>source file</id>
      <phase>process-resources</phase>
      <goals>
        <goal>exec</goal>
      </goals>
      <configuration>
        <executable>source</executable>
        <arguments>
          <argument>./run.sh</argument>
        </arguments>
      </configuration>
    </execution>
  </executions>
</plugin>

and

<plugin>
    <artifactId>maven-antrun-plugin</artifactId>
    <groupId>org.apache.maven.plugins</groupId>
    <executions>
        <execution>
            <id>source file</id>
            <phase>process-resources</phase>
            <goals>
              <goal>run</goal>
            </goals>
            <configuration>
                <target>
                    <exec executable="source">
                        <arg value="./run.sh"/>
                    </exec>
                </target>
            </configuration>
        </execution>
    </executions>
</plugin>

They both fail saying that the command source does not exist

I based my answer on @walyrious idea. I execute bash -c 'source run.sh; custom-script.sh' in maven-antrun-plugin so that custom-script.sh is in the same shell as the sourced run.sh. Though, I think this maven execution is much cleaner than his answer:

<plugin>
    <artifactId>maven-antrun-plugin</artifactId>
    <groupId>org.apache.maven.plugins</groupId>
    <executions>
        <execution>
            <id>source file</id>
            <phase>process-resources</phase>
            <goals>
              <goal>run</goal>
            </goals>
            <configuration>
                <target>
                    <exec executable="bash">
                        <arg line="-c 'source run.sh; custom-script.sh'"/>
                    </exec>
                </target>
            </configuration>
        </execution>
    </executions>
</plugin>