hakurei 0.1.2

Enhancements:
- Per-container configurable lingering process wait delay.
- Optionally forward `container` context cancellation to the initial process.
- Expose signal forwarding behaviour in `hst`.

Internal:
- Use more reliable nonexistence.
- Improve container testing setup.
- Move shim signal handler outcome to Go.
-----BEGIN SSH SIGNATURE-----
U1NIU0lHAAAAAQAAADMAAAALc3NoLWVkMjU1MTkAAAAg/+8EpV0uLIR+MAtm7kYw4ssYDi
TAEe6cY2wdrwBLU38AAAADZ2l0AAAAAAAAAAZzaGE1MTIAAABTAAAAC3NzaC1lZDI1NTE5
AAAAQOPH6wYN68OhCdg/3QiuzowcgWZXpqMouVzB/jA8mVjJqw+1um00hx1B7oNYI9hVMQ
VAso5M6Ltj8E0lfYXHWQg=
-----END SSH SIGNATURE-----