publish package:gcloud after the repo move

[devoncarew]

• publish package:gcloud after the repo move

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• I’ve reviewed the contributor guide and applied the relevant portions to this PR.

Contribution guidelines:

• See our contributor guide for general expectations for PRs.
• Larger or significant changes should be discussed in an issue before creating a PR.
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[github-actions]

Package publishing

Package	Version	Status	Publish tag (post-merge)
package:gcloud	0.8.15	ready to publish	gcloud-v0.8.15
package:native_synchronization	0.3.1	already published at pub.dev

Documentation at https://github.com/dart-lang/ecosystem/wiki/Publishing-automation.