fix: add default path for fc

[czy88840616]

No description provided.

[gitpod-io]

[codecov-commenter]

Codecov Report

Merging #584 into serverless will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           serverless     #584   +/-   ##
===========================================
  Coverage       80.45%   80.45%           
===========================================
  Files              99       99           
  Lines            3827     3827           
  Branches          515      516    +1     
===========================================
  Hits             3079     3079           
  Misses            742      742           
  Partials            6        6           

Impacted Files	Coverage Δ
packages/serverless-spec-builder/src/fc/builder.ts	85.18% <100.00%> (ø)

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