v1.12.14

• zstd: use github.com/klauspost/compress directly
• Add support for installing man pages
• Remove merged directory when it is unmounted
• Switch to golangci-lint
• Update generated files
• Keep track of the UIDs and GIDs used in applied layers
• Add cirrus vendor check
• Switch to go modules
• Use same variable name on both commands
• cirrus: ubuntu: try removing cryptsetup-initramfs
• Move lockfiles to their own package
• getLockfile(): use the absolute path
• lockfile: don't bother releasing a lock when closing a file
• locking: take read locks on read-only stores
• locking test updates