fix(fs): skip dirs

[knqyf263]

Close #968
Ref aquasecurity/fanal#173

[codecov]

Codecov Report

Merging #969 (50ddd04) into main (a00d719) will decrease coverage by 6.40%.
The diff coverage is 51.38%.

@@            Coverage Diff             @@
##             main     #969      +/-   ##
==========================================
- Coverage   68.50%   62.10%   -6.41%     
==========================================
  Files          57       65       +8     
  Lines        2210     2615     +405     
==========================================
+ Hits         1514     1624     +110     
- Misses        564      857     +293     
- Partials      132      134       +2     

Impacted Files	Coverage Δ
pkg/commands/artifact/config.go	81.81% <ø> (ø)
pkg/commands/artifact/fs.go	0.00% <0.00%> (ø)
pkg/commands/artifact/image.go	0.00% <0.00%> (ø)
pkg/commands/artifact/repository.go	0.00% <0.00%> (ø)
pkg/commands/artifact/run.go	0.00% <0.00%> (ø)
pkg/commands/artifact/wire_gen.go	0.00% <0.00%> (ø)
pkg/commands/client/config.go	79.31% <ø> (ø)
pkg/commands/client/run.go	0.00% <0.00%> (ø)
pkg/commands/client/wire_gen.go	0.00% <0.00%> (ø)
pkg/commands/config/cache.go	100.00% <ø> (ø)
... and 42 more

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