This example packages a custom sdc.properties file within an SDC image, along with a set of SDC stage libs (including Enterprise stage libs), at the time the image is built.
This approach is suitable for execution SDCs whose configuration and stage libs do not need to be dynamically set. The sdc.properties file "baked in" to the custom SDC image may include custom settings for properties like production.maxBatchSize and email configuration if these properties are consistent across deployments.
Set http.realm.file.permission.check=false in your sdc.properties file to avoid permission issues.
See the Dockerfile and build.sh in the sdc-docker-custom-config directory.