ci: set up an action release pipeline

[avidal]

This patch sets up an action release pipeline on merges to main which
resembles the gitlab release pipeline.

On a merge to main, the workflow kicks in and (assuming everything
builds and tests well), updates the action branch with the contents of
action-template/.

The workflow leverages the bundled action, which ensures that, at the
very least, we cannot produce a tagged release of the action that cannot
at least release itself.

Note that the action branch contains the binaries built earlier in the
workflow to avoid having to run a composite action.

[datadog-datadog-prod-us1]

✅ Libraries

ℹ️ Info

🎉 All green!

📚 No new vulnerable libraries detected

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