Add v2 tag about action-setup

[aminya]

Because I shouldn't care about keeping setup-pnpm up to date. I just want to use v1 and be sure that it works all the time.

All the actions by GitHub already provide this tag. pnpm should not be different.
https://github.com/actions
setup-node
https://github.com/actions/setup-node/releases/tag/v2
https://github.com/actions/setup-node/releases/tag/v1

[KSXGitHub]

Is the v2 branch so that we can use pnpm/action-setup@v2 without having a tag called v2?

Yes. And I created a branch instead of a tag because updating a tag is more verbose.

[KSXGitHub]

Tags are supposed to be immutable. A v1 tag would have to either be outdated or mutable.

If you want to always use latest v1, would don't you just use services like renovate or dependabot to constantly keep track for you?

[einSelbst]

hey @aminya, I'm also not sure if I understand you correctly (always use LATEST version of this action or always use SAME version).
If you always want to use the LATEST version you can also

- name: Setup PNPM
  uses: pnpm/action-setup@master
  with: 
    version: next

[aminya]

v1 guarantees that there are no breaking changes, but master can break things any time.

[einSelbst]

@aminya there is this: https://github.com/pnpm/action-setup/releases/tag/v1

[KSXGitHub]

@einSelbst It's outdated

[KSXGitHub]

I have created v2 branch.

[ChocolateLoverRaj]

Tags are supposed to be immutable.

I have created v2 branch.

@KSXGitHub Is the v2 branch so that we can use pnpm/action-setup@v2 without having a tag called v2?