fix(ci): retry pkg-pr-new publish on transient failures

[antfubot]

Description

The "Release Commit" check has been intermittently failing on open PRs (e.g. #465, #468) with:

Check failed (404): {"url":"/check","statusCode":404,"statusMessage":"Not Found","message":"There is no workflow defined for ...","stack":""}

This is a known transient issue in the external pkg-pr-new continuous-release service (see stackblitz-labs/pkg.pr.new#95, #147, #316, #413) — not a problem with this repo's build. Re-running the same commit (e.g. via the push-triggered run) succeeds without any code change, confirming the failure is external and non-deterministic.

This PR wraps the pkg-pr-new publish step in a retry loop (3 attempts, backoff) so a transient hiccup from the third-party service no longer fails the "Release Commit" check.

Linked Issues

Additional context

Verified the workflow YAML is syntactically valid; no other CI workflows were affected.

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This PR was created with the help of an agent.

[pkg-pr-new]

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@vitejs/devtools

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@vitejs/devtools-kit

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@vitejs/devtools-oxc

npm i https://pkg.pr.new/@vitejs/devtools-oxc@469

@vitejs/devtools-rolldown

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@vitejs/devtools-vite

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@vitejs/devtools-vitest

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commit: 189b3be