Copy recursively directories, symlinks, files copies from src to dst Copy will make dirs as necessary, and keep file modes Symlinks will be dereferenced similar to `cp -r src dst`.

CopyFile copies a file from src to dst.

IsAbs is like filepath.IsAbs but also considering posix absolute paths to be absolute even if filepath.IsAbs would not This fixes the case of Posix paths on Windows.

TempDir is like os.MkdirTemp, but more docker friendly.