miniflux: handle missing database file

Frederico Gomesrequested to merge
ichiban/freedombox:miniflux/handle-missing-database-file into main

This MR addresses #2562 (closed)

  • create get_credentials function that parses /etc/dbconfig-common/*.conf files
  • replace previous credentials sourcing method
  • updated backup/restore functions to fetch config using get_credentials

Signed-off-by: Frederico Gomes fredericojfgomes@gmail.com

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