Log Message:
Initial addition of sandboxctl 1.0:

sandboxctl is a tool to interact with chroot-based sandboxes.

The sandboxctl tool provides an automated mechanism to create and
interact with chroot-based sandboxes.  These sandboxes can be transient
(e.g. to run a single command within them) or long-lived (e.g. to run a
system service in a safe manner).

Sandboxes can be created using multiple mechanisms, which range from
extracting fresh distribution sets to bind-mounting the outer file
systems inside the sandbox.  The specific mechanism depends on the
features supported by the underlying operating system and the chosen
sandbox type.  Currently, sandboxctl includes support for FreeBSD,
Linux, macOS (Darwin), and NetBSD.

Each sandbox is defined via a configuration file provided by the user
and a system-specific template provided by this package.  The user
configuration is simple and semantically-rich, allowing the system
administrator to not worry about the environment-specific details.

This package is primarily targetted at supporting pkgtools/pkg_comp
but is provided as a standalone tool for flexibility.