MkdirTemp creates a new temporary directory in the directory dir
and returns the pathname of the new directory.
The new directory's name is generated by adding a random string to the end of pattern.
If pattern includes a "", the random string replaces the last "" instead.
The directory is created with mode 0o700 (before umask).
If dir is the empty string, MkdirTemp uses the default directory for temporary files, as returned by TempDir.
Multiple programs or goroutines calling MkdirTemp simultaneously will not choose the same directory.
It is the caller's responsibility to remove the directory when it is no longer needed.
MkdirTemp creates a new temporary directory in the directory dir and returns the pathname of the new directory. The new directory's name is generated by adding a random string to the end of pattern. If pattern includes a "", the random string replaces the last "" instead. The directory is created with mode 0o700 (before umask). If dir is the empty string, MkdirTemp uses the default directory for temporary files, as returned by TempDir. Multiple programs or goroutines calling MkdirTemp simultaneously will not choose the same directory. It is the caller's responsibility to remove the directory when it is no longer needed.