fix(ci): 修改pnpm最新版升级到9.0造成的构建问题

[ddadaal]

pnpm的最新版升级到了9.0，Lockfile版本从6.x更新到了9.x，pnpm老版本8.x不兼容9.x的lockfile。而现在在容器构建时，执行pnpm fetch时下载的pnpm为最新版9.0，而此时所使用的lockfile为6.x，新版本的pnpm会在执行pnpm fetch时把lockfile更新到最新的9.x版本，但是后面在执行后续的pnpm指令时使用的pnpm版本为老版本8.x，不兼容最新的lockfile。

由于 vercel/turbo#7993 问题，现在不能升级pnpm到最新的9.0版本。

此PR把package.json在执行pnpm fetch执行复制进了容器，使得执行pnpm fetch时所使用的pnpm版本为指定的版本而非最新版，保证lockfile不会意外改变。

[changeset-bot]

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Latest commit: 8489761

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