Update .gitignore and modify development configuration

[AndrGab]

• Add new configuration files to .gitignore
• Change database hostname in dev.exs to 'db'
• Import additional secret configuration for development environment if it exists

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.23%. Comparing base (362cb1b) to head (ac46cb6).
⚠️ Report is 1 commits behind head on main.
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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #43   +/-   ##
=======================================
  Coverage   69.23%   69.23%           
=======================================
  Files          27       27           
  Lines         247      247           
=======================================
  Hits          171      171           
  Misses         76       76           

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