maven-sync-setup/sync/settings.xml

<settings>
  <profiles>
    <profile>
      <id>reposilite</id>
      <repositories>
        <repository>
          <id>central</id>
          <name>Central Repository</name>
          <url>http://localhost:9001/releases</url>
          <layout>default</layout>
          <snapshots>
            <enabled>false</enabled>
          </snapshots>
        </repository>
        <repository>
          <id>snapshots-repo</id>
          <url>http://localhost:9001/snapshots</url>
          <releases>
            <enabled>false</enabled>
          </releases>
          <snapshots>
            <enabled>true</enabled>
          </snapshots>
        </repository>
      </repositories>
    </profile>
  </profiles>
  <activeProfiles>
    <activeProfile>reposilite</activeProfile>
  </activeProfiles>
</settings>