apptainer/singularity v3.8.6 on GitHub

Update builds to require at least golang version 1.16.12, and update package builds to build the go toolchain from source if the provided version is too old.
Auto-generate release assets including the distribution tarball and rpm (built on CentOS 7) and deb (built on Debian 11) x86_64 packages.
Update dependency to correctly unset variables in container startup environment processing. Fixes regression introduced in singularity-3.8.5.
Remove subshell overhead when processing large environments on container startup.
make install now installs man pages. A separate make man is not required. As a consequence, man pages are now included in deb packages.

apptainer/singularity v3.8.6 Singularity 3.8.6 on GitHub