Udocker

* Add support to access non-config metadata from containers
* Added support for multiplatform manifests and indices: closes 392, 355

* Build udockertools 1.2.9 and set it as default
* Add Fn support for Ubuntu:22
* Remove files to be installed
* Set Fn preference to use runc

* Remove deprecated unit tests. udocker is the same as version 1.3.6

* Re-implement udocker namespace: closes 380
* Login fails all the time: closes 379
* Ignore image loading if already exists: closes 378

* Fix python backwards compatibility issues: closes 374
* Fix incorrectly reported errors by image verification
* Fix image search returning empty results
* Fix issue with logical links in the udocker executable path
* Add check to verify if container name exists before creation
or cloning
* Add --force option to create and clone to allow creation
of container even if the intended name given by --name exists
* Prevent closing of file descriptors upon engine invocation
improves PMI process management interface interoperability
* Fix issues in import and export while using pipes.
* Fix image name parsing where "library" component is missing: closes 359

* Fix 2 unit tests