Create a Talend Open Studio for Data Integration Job and build it. Extract the contents into the folder that is mounted into /var/data/job such that the jobInfo.properties file is accessible at /var/data/job/jobInfo.properties. The container will trigger the job automatically each time a new file is created or moved into /var/data/input using incron, the output will be stored into /var/data/output.
The Talend-Job has to be configured such that all input files are read from /var/data/input and all output files are written to /var/data/output. The job has to clean up the input directory itself.