[DOP-25329] Add example of generating random secret keys #1319

Job	Run time
Oracle tests / Run Oracle tests	4m 19s
Clickhouse tests / Run Clickhouse tests	4m 26s
HDFS tests / Run HDFS tests	4m 37s
MySQL tests / Run MySQL tests	4m 4s
FTP tests / Run FTP tests	4m 36s
Hive tests / Run Hive tests	4m 30s
MSSQL tests / Run MSSQL tests	3m 59s
Unit tests / Run unit tests	4m 23s
SFTP tests / Run SFTP tests	3m 41s
S3 tests / Run S3 tests	4m 28s
FTPS tests / Run FTPS tests	4m 33s
Samba tests / Run Samba tests	3m 57s
WebDAV tests / Run WebDAV tests	4m 38s
Scheduler tests / Run Scheduler tests	1m 54s
Tests done	20s
	58m 25s

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