Make marketplace publish reruns tolerant of duplicate package failures

[Copilot]

PublishToMarketplaceStep currently fails hard when a rerun encounters packages that were already published. This updates the release pipeline to treat the known duplicate-package vsce error as success, while still retrying real publish failures with the requested 1/3/5 minute backoff schedule.

• Publish step resiliency

  • Wraps vsce @publishArgs so the step can inspect both command output and exit code before deciding whether to fail, retry, or continue.
  • Preserves the existing visible vsce command logging.

• Duplicate publish detection

  • Adds a small PowerShell helper that matches the vsce duplicate-package error line shape, e.g. ERROR ... v<version> already exists.
  • Treats that case as a successful no-op so rerunning the step does not fail after artifacts are already in the marketplace.

• Retry behavior for real failures

  • Retries non-duplicate failures up to 3 times after the initial attempt.
  • Uses the requested delays: 1 minute, then 3 minutes, then 5 minutes.
  • Logs attempt numbers and the retry delay, along with the last relevant output line for fast diagnosis.

• Failure handling

  • Fails clearly after the final unsuccessful attempt.
  • Leaves parameters.test == true behavior unchanged.

Write-Host "##[command]vsce $publishArgs"

$publishOutputLines = & vsce @publishArgs 2>&1 | Out-String -Stream
$exitCode = $LASTEXITCODE

if ($exitCode -eq 0) {
  # success
} elseif (Test-AlreadyPublishedFailure -CommandOutputLines $publishOutputLines) {
  # duplicate publish on rerun -> treat as success
} else {
  # retry with 1/3/5 minute backoff, then fail clearly
}

[Copilot]

Pull request overview

Updates the release pipeline publishing logic to be resilient to reruns where VSIX packages were already published, by centralizing the publish behavior in a PowerShell helper that can interpret vsce output and apply retry/backoff rules.

Changes:

• Replace direct vsce publish invocation in release.yml with a Publish-Vsix.ps1 helper that supports duplicate-package detection and retries with 1/3/5 minute backoff.
• Remove the global @vscode/vsce install step and run vsce via npx inside the helper script.
• Ensure Publish-Vsix.ps1 is included in the build artifact (Packages) so the release pipeline can execute it.

Show a summary per file

File	Description
azure-pipelines/release.yml	Switches marketplace publishing to run Publish-Vsix.ps1 (with PreRelease/DryRun/CI flags) and sets isPrerelease output.
azure-pipelines/Publish-Vsix.ps1	New script that publishes signed VSIXes via npx @vscode/vsce, detects duplicate-package errors, and retries failures with backoff.
azure-pipelines/build-vsix.yml	Copies Publish-Vsix.ps1 into the Packages artifact so it’s available during release publishing.

Copilot's findings

• Files reviewed: 3/3 changed files
• Comments generated: 2

[JoeRobich]

I have run this locally and did not run into any issue here.

[Copilot]

Copilot's findings

• Files reviewed: 3/3 changed files
• Comments generated: 1

[Copilot]

Copilot's findings

• Files reviewed: 3/3 changed files
• Comments generated: 1