ci(workflow): add cache to workflows using actions/setup-node

[oscard0m]

Description

Add cache to workflows using actions/setup-node

Context

setup-node GitHub Action just released a new option to add cache to steps using it.

You can find the details here: https://github.blog/changelog/2021-07-02-github-actions-setup-node-now-supports-dependency-caching/

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[oscard0m]

Hi @brcrista ! Could I get more info on why this PR has been closed?

Thanks

[brcrista]

@oscard0m Sorry, to be honest I mistook this for a spam PR. (We get a lot of those.) I see now that the relevant change is

     - name: Setup node 12
        uses: actions/setup-node@v2
        with:
          node-version: 12
          cache: npm

I can't reopen this PR because it looks like your fork no longer exists, but if you can recreate the PR without the extra formatting changes we can give it a look.

It would also be helpful if you could show us what kind of speedup we observe from caching.

[oscard0m]

I had to recreate it in #179