ci: replace hosted `semver` with an action

[madhead]

I've noticed, that you are using a curl to download a semver tool from https://raw.githubusercontent.com to work with semantic versions.

I propose to use my reusable GitHub Action to accomplish the same task. Using the reusable action has, from my point of view, some benefits, like being more native and natural and less surprising way of doing things in GitHub Actions Workflows.

If you would like to ensure it works the same way as before, I've tested it in my fork:

• A successful run is here, take a look at the way it parsed the input. It's identical to the old way, isn't it?
• The workflow I used for the check is here. I've commented some things out because they are optional for the purpose.
• Guarding against invalid input also works.

Thank you!

[hashicorp-cla]

All committers have signed the CLA.

[madhead]

Yes, sure. I understand. That's the reason I used a fixed tag, and not @latest or master. I saw you already used external actions in a few places:

• https://github.com/hashicorp/nomad/blob/ff1a30fe8dd4a0da38ddd34915b0be2210d39614/.github/workflows/release.yml#L144
• https://github.com/hashicorp/nomad/blob/ff1a30fe8dd4a0da38ddd34915b0be2210d39614/.github/workflows/ember-test-audit.yml#L20
• https://github.com/hashicorp/nomad/blob/ff1a30fe8dd4a0da38ddd34915b0be2210d39614/.github/workflows/ember-test-audit.yml#L60
• https://github.com/hashicorp/nomad/blob/ff1a30fe8dd4a0da38ddd34915b0be2210d39614/.github/workflows/ember-test-audit.yml#L68
• https://github.com/hashicorp/nomad/blob/ff1a30fe8dd4a0da38ddd34915b0be2210d39614/.github/workflows/test-core.yaml#L40
• https://github.com/hashicorp/nomad/blob/ff1a30fe8dd4a0da38ddd34915b0be2210d39614/.github/workflows/semgrep.yml#L18

So I might have a chance :relaxed:

[lgfa29]

Oh, sorry for the delay here, I didn't see this PR before and this was actually a workflow that I created.

For now I'm thinking of keeping it as-is because I'm not 100% sure where we will go in terms of automating our release process, so keeping it more script-like makes it easier for us to port it to whatever direction we go.

But thank you very much for the work here @madhead. I will keep your action in mind as we cement our release process 🙂

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