Gate API image publish on successful build

[dkhalife]

Summary

• make the API canary image stage depend on the Go build stage
• publish only after a successful build while continuing to skip pull requests

[Copilot]

Pull request overview

This PR updates the Azure DevOps API pipeline so the canary image publish stage only runs after the Go build stage has completed successfully, while still skipping image publishing for pull request builds.

Changes:

• Add an explicit dependsOn: build to the push_canary stage to ensure it waits for the build stage.
• Gate the canary image job with and(succeeded(), ne(variables['Build.Reason'], 'PullRequest')) so it publishes only on successful non-PR runs.

Show a summary per file

File	Description
.azuredevops/api-build.yml	Ensures canary image publishing is dependent on a successful build and remains disabled for PRs.

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