feat(flagd): add support for GCS

[uthark]

This PR

Allow to configure GCS buckets.

Tested locally, confirmed that flagd deployment is created and that deployment can pull the data (tested on GKE with Workload identity support enabled)

• adds this new feature

Related Issues

Relates to #758

Notes

Follow-up Tasks

How to test

configured feature source to use gs buckets:

  spec:
    sources:
    - interval: 15
      provider: gcs
      source: gs://my-bucket/test.json

[uthark]

@beeme1mr could you please have a look?

[codecov]

Codecov Report

Attention: Patch coverage is 20.00000% with 8 lines in your changes missing coverage. Please review.

Project coverage is 71.55%. Comparing base (499661e) to head (abde60d).
Report is 63 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/common/flagdinjector/flagdinjector.go	0.00%	8 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #765       +/-   ##
===========================================
- Coverage   86.51%   71.55%   -14.97%     
===========================================
  Files          19       30       +11     
  Lines        1587     2299      +712     
===========================================
+ Hits         1373     1645      +272     
- Misses        173      606      +433     
- Partials       41       48        +7     

Files with missing lines	Coverage Δ
api/core/v1beta1/common/common.go	82.97% <100.00%> (ø)
internal/common/flagdinjector/flagdinjector.go	90.21% <0.00%> (ø)

... and 11 files with indirect coverage changes

Flag	Coverage Δ
unit-tests	71.55% <20.00%> (∅)

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[uthark]

@beeme1mr should I try to write tests?

[toddbaert]

@beeme1mr should I try to write tests?

No I think this is minimal enough not to require them. I can override the check.