sylabs/singularity: Singularity 3.5.1 Release Candidate 2

This is the second release candidate for the upcoming Singularity 3.5.1 bugfix release. New features / functionalities A single feature has been added in the bugfix release, with specific functionality: A new option allow container encrypted can be set to no in singularity.conf to prevent execution of encrypted containers. Bug Fixes This bugfix release addresses the following issues: Fixes a disk space leak when building from docker-archive. Makes container process SIGABRT return the expected code. Fixes the inspect command in unpriveleged workflow. Sets an appropriate default umask during build stages, to avoid issues with very restrictive user umasks. Fixes an issue with build script content being consumed from STDIN. Corrects the behaviour of underlay with non-empty / symlinked CWD and absolute symlink binds targets. Fixes execution of containers when binding BTRFS filesystems. Fixes build / check failures for MIPS & PPC64. Ensures file ownership maintained when building image from sandbox. Fixes a squashfs mount error on kernel 5.4.0 and above. Fixes an underlay fallback problem, which prevented use of sandboxes on lustre filesystems. Thanks to our contributors for code, feedback, and testing efforts! As always, please report any bugs to: https://github.com/sylabs/singularity/issues/new If you think that you've discovered a security vulnerability please report it to: security@sylabs.io Have fun