fix: fix shared dir use relative path

[czy88840616]

No description provided.

[codecov-io]

Codecov Report

Merging #55 into master will increase coverage by 1.56%.
The diff coverage is 87.5%.

@@            Coverage Diff             @@
##           master      #55      +/-   ##
==========================================
+ Coverage   69.32%   70.88%   +1.56%     
==========================================
  Files          69       69              
  Lines        1946     1951       +5     
  Branches      183      184       +1     
==========================================
+ Hits         1349     1383      +34     
+ Misses        563      534      -29     
  Partials       34       34

Impacted Files	Coverage Δ
packages/faas-cli-plugin-package/src/index.ts	66.32% <87.5%> (+8.87%)	⬆️
packages/faas-cli-plugin-package/src/utils.ts	71.42% <0%> (+49.99%)	⬆️

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