Pass DB connection details using file instead of env. variables #6353
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This PR uses temporaty file to pass DB connection details. The file is created in subdirectory of OS temporaty directory and has only minimal (read) permission for user running NBLS.Other system users does not have even read permission (this is similar to ssh private key files. If the setting of correct permissions fails, the file the temporary file is deleted immediatelly. The temporaty file is deleted as soon as debugging session ends. If the NBLS and VScode are hard killed and the temporary file remains on filesystem, it is deleted on the subsequent startup of NBLS.