chore(deps): update nixos/nix docker digest to 7a007c7

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
nixos/nix	final	digest	377d488 → 7a007c7

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 37.71%. Comparing base (b29508f) to head (e6c8fc9).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #123      +/-   ##
==========================================
+ Coverage   37.62%   37.71%   +0.09%     
==========================================
  Files          28       28              
  Lines        3216     3216              
==========================================
+ Hits         1210     1213       +3     
+ Misses       1917     1913       -4     
- Partials       89       90       +1     

see 1 file with indirect coverage changes

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