refactor pipeline

See merge request !9

tut01 test new pipeline workflow

See merge request !8

Tut01 test exercise

See merge request !6

Tut01 test exercise

See merge request !5

Tut01 test exercise

See merge request !3

trigger pipeline

See merge request !2

Define and run a pipeline

See merge request !1

Although, password file is checked during config validation, sth may have changed the
file content in the short period of time between validation and DB client initialization,
hence exiting in case of an error