fix(env): do not inline process.env

[florian-lefebvre]

Changes

• Reported on docs: add note about environment variables with output: 'server' docs#12648
• During an Astro build, Vite is started in dev and build several times, sometimes even in parallel
• The astro:env Vite plugin had some caching logic that retained the dev behavior in build, resulting in inlining process.env in the build output in some cases
• This PR refactors this Vite plugin to avoid this situation

Testing

Manual, should pass

Docs

Changeset

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🦋 Changeset detected

Latest commit: 4ed97ff

The changes in this PR will be included in the next version bump.

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[codspeed]

CodSpeed Performance Report

Merging #14712 will not alter performance

_{Comparing fix/do-not-inline-process-env (4ed97ff) with main (970ac0f)¹}

Summary

✅ 6 untouched

Footnotes

1. No successful run was found on main (dae9d3f) during the generation of this report, so 970ac0f was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩