Document SOURCE_DATE_EPOCH support #903
Description
Support for SOURCE_DATE_EPOCH was added in:
However, I only see it mentioned on this migration page:
https://buildpacks.io/docs/for-platform-operators/how-to/migrate/platform-api-0.8-0.9/#configurable-image-create-time
It should probably be added to:
https://buildpacks.io/docs/for-app-developers/concepts/reproducibility/
And maybe elsewhere? (Perhaps also the pack build --help entry for --creation-time?)