Add --once and --writable flags to ttyd command

[koki-develop]

The web terminal is readonly by default now, to make it writable, use -W option.

https://github.com/tsl0922/ttyd/releases/tag/1.7.4

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (be9c92d) 75.73% compared to head (7ddb1d3) 75.89%.
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #118      +/-   ##
==========================================
+ Coverage   75.73%   75.89%   +0.15%     
==========================================
  Files          12       12              
  Lines         305      307       +2     
==========================================
+ Hits          231      233       +2     
  Misses         65       65              
  Partials        9        9              

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