Dockerfiles will be generated referring to JSON files in this directory. To update Dockerfiles, first, delete old Dockerfiles with make clean, then generate new Dockerfiles with make setup.
The latest two versions of stack files which exist for each version of R (X.Y.Z.json), and other stack files with alphabetic names, are automatically updated by make-stacks.R, which is executed daily by GitHub Actions.
This means that only stack files with older version numbers can be manually edited without changing the script.
See the build directory for details.