[#674] Support env var in ssh config

[yohamta]

Resolves #674

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.08%. Comparing base (87a33e6) to head (92f8db7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #683   +/-   ##
=======================================
  Coverage   64.08%   64.08%           
=======================================
  Files          53       53           
  Lines        4318     4318           
=======================================
  Hits         2767     2767           
  Misses       1298     1298           
  Partials      253      253           

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