GCS: fix the WithoutAuthentication option

[haoxins]

What type of PR is this?

• bug
• feature
• enhancement

What problem(s) does this PR solve?

When you run the application in the GCP ENVs, such as GKE or GCE.
The GCS client will try to get credentials underlying the ENVs.

See https://cloud.google.com/kubernetes-engine/docs/concepts/workload-identity

Unless the user specifies that, we shouldn't set the WithoutAuthentication option.

How do you solve it?

Special notes for your reviewer, ex. impact of this fix, design document, etc:

[veezhang]

@haoxins Thanks!
Can you fix the testing ?
BTW, do you know which env has the effect?

[haoxins]

I need to find a solution to fix the test.
The test failed because it is not running on the GKE/GCE environment.

https://cloud.google.com/docs/authentication/application-default-credentials?hl=zh-cn#attached-sa

[veezhang]

@haoxins Setting WithoutAuthentication to true may solve the problem.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (1cbec84) 87.89% compared to head (feb24d8) 87.89%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #290   +/-   ##
=======================================
  Coverage   87.89%   87.89%           
=======================================
  Files          79       79           
  Lines        3857     3857           
=======================================
  Hits         3390     3390           
  Misses        458      458           
  Partials        9        9           

Files Changed	Coverage Δ
pkg/source/gcs.go	85.00% <100.00%> (ø)

☔ View full report in Codecov by Sentry.
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[haoxins]

@haoxins Setting WithoutAuthentication to true may solve the problem.

fixed

[veezhang]

@haoxins Thanks a lot!

[veezhang]

LGTM