Thanks for the quick reply!
I have found another post that fixes the problem without having to re-engineer the pipeline - Camunda cannot read XSD when running a packaged Spring Boot application
Apparently, we need to add the version of the spring-boot-maven-plugin in the pom.xml
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
**<version>2.0.1.RELEASE</version>**
<configuration>
<layout>ZIP</layout>
</configuration>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>