feat: support json secrets

[WtfJoke]

Fixes #22

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (main@88e509b). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #24   +/-   ##
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  Coverage        ?   98.21%           
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  Files           ?       18           
  Lines           ?      336           
  Branches        ?       33           
=======================================
  Hits            ?      330           
  Misses          ?        6           
  Partials        ?        0           

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