Set RPC secret for devservices context

[NicoHinderling]

Missing when trying to run launchpad with devservices up --mode launchpad command

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.17%. Comparing base (7ec7639) to head (709e411).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #367   +/-   ##
=======================================
  Coverage   79.17%   79.17%           
=======================================
  Files         147      147           
  Lines       11686    11686           
  Branches     1201     1201           
=======================================
  Hits         9252     9252           
  Misses       2011     2011           
  Partials      423      423           

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