why not separate Git repo for each study
This repository contains studies on new ideas for Maven: it‘s a replacement for Subversion times’ Maven Sandbox with an organization optimized for Git, using orphaned branches instead of directories.
Notice: in the past, it required infra to create a Git repository, but self service was later provided. What remains not self service is Git repository deletion (not even sure it is accepted) or archival.
Each study is managed in a separate Git orphan branch.
git checkout --orphan my-new-study rm .git/index git clean -fdx
Studies can publish a site to https://maven.apache.org/studies/