Explicitly exit the process to not wait for hanging promises

[xiniria]

Description:
Since Node.js 19, the default for keepAlive was changed from false to true. As explained in this similar issue for the Ruby setup action, this causes the Post setup Node action to hang for somewhere between 1 and 5 minutes after running. This PR explicitly exits the process once the run function is completed, to not wait for hanging promises.

Related issue:
Fixes #878

Check list:

• Mark if documentation changes are required.
• Mark if tests were added or updated to cover the changes.

[Bo98]

Change works as a quick fix, but it's worth noting the proper fix would be to merge actions/toolkit#1572 (or a similar fix on actions/toolkit level) otherwise we'd be copy pasting this exit process hack to tons of other actions/* that cache internally as they update to Node 20.

[xiniria]

Change works as a quick fix, but it's worth noting the proper fix would be to merge actions/toolkit#1572 (or a similar fix on actions/toolkit level) otherwise we'd be copy pasting this exit process hack to tons of other actions/* that cache internally as they update to Node 20.

I totally agree, but since we have no leverage over when (or even if) this other PR is merged, this should improve things for a lot of users out there in the meantine, don't you think?

[Bo98]

Yeah for sure. Though given GitHub control both repositories, there's a chance the right person will see it here.

External contributions to actions/toolkit are not currently being reviewed (and haven't for a year) so it felt it was worth mentioning in case they want to make a similar fix themselves. If the toolkit and setup-node teams are totally separate and usually don't collaborate then yeah I imagine merging your workaround makes sense.

[xiniria]

@nikolai-laevskii could you have a look at the PR?

[xaviermarchal]

@nikolai-laevskii any news on this PR that could help us a lot on our delivery?