Many package updates

Validation and bugfixes

- validate yaml for pkg build and linuxkit build
- handle unchanged builder config toml properly
- better handling of docker dry run

lock and version output bug fixes

Release v1.8.0 with bug fixes and features

- runc 1.3.0, containerd 2.1.4
- dry run for pkg build
- erofs format output
- dynamically calculated build args
- custom build args
- custom certificates
- mirror support

Bugfixes and features

- containerd 2.1.4
- runc 1.3.0
- other package updates

registry auth bugfix

small package changes, primarily alpine base from v3.19 to v3.21, and…

… all dependencies

extra pkg builder support

cleaner cache locking

handle lock on initial cache creation