Merge branch 'jc/safe-implicit-bare'

Users with safe.bareRepository=explicit can still work from within $GIT_DIR of a seconary worktree (which resides at .git/worktrees/$name/) of the primary worktree without explicitly specifying the $GIT_DIR environment variable or the --git-dir=<path> option. * jc/safe-implicit-bare: setup: notice more types of implicit bare repositories