Add Custom Staging Bucket Option

[shikanime]

Expected behavior

Users should be able to specify a custom staging bucket for Skaffold builds, such as a bucket with a specific region constraint or naming convention.

Actual behavior

Skaffold will create a new staging bucket if it does not exist, but there is no option to specify a custom bucket.

skaffold/pkg/skaffold/build/gcb/cloud_build.go

Lines 109 to 123 in 30dda17

	cbBucket := fmt.Sprintf("%s%s", projectID, constants.GCSBucketSuffix)
	buildObject := fmt.Sprintf("source/%s-%s.tar.gz", projectID, uuid.New().String())
	if err := b.createBucketIfNotExists(ctx, c, projectID, cbBucket); err != nil {
	return "", sErrors.NewErrorWithStatusCode(&proto.ActionableErr{
	ErrCode: proto.StatusCode_BUILD_GCB_CREATE_BUCKET_ERR,
	Message: fmt.Sprintf("creating bucket if not exists: %s", err),
	})
	}
	if err := b.checkBucketProjectCorrect(ctx, c, projectID, cbBucket); err != nil {
	return "", sErrors.NewErrorWithStatusCode(&proto.ActionableErr{
	ErrCode: proto.StatusCode_BUILD_GCB_GET_GCS_BUCKET_ERR,
	Message: fmt.Sprintf("checking bucket is in correct project: %s", err),
	})
	}

I am open to contributing if the issue is relevant and I am not missing something that might solve my problem.

Information

• Skaffold version: v2.10.0
• Operating system: Ubuntu 22.04.3 LTS
• Installed via: Nixpkgs
• Contents of skaffold.yaml:

apiVersion: skaffold/v4beta6
kind: Config
metadata:
  name: foo
build:
  artifacts:
    - image: europe-docker.pkg.dev/foo/app
      kaniko: {}
  googleCloudBuild:
    projectId: foo
    region: europe-west9

creating bucket if not exists: googleapi: Error 412: 'us' violates constraint 'constraints/gcp.resourceLocations', conditionNotMet