ci: reusable publish-soldeer workflow

[thedavidmeister]

Summary

Lift the soldeer publish workflow into rainix as a workflow_call reusable. Closes #135.

rain.solmem proved out the workflow shape (rain.solmem#34, rain.solmem v0.1.1 tag — registry-side rain-solmem project still needs creating before the actual push lands). With one repo's-worth of evidence that the steps work, copy-pasting the same YAML into 12+ rain.* repos as they soldeer-migrate is exactly the drift trap that hit us with sol-prelude. This PR moves it once.

Consumer wrapper

name: Publish to Soldeer
on:
  push:
    tags: ["v*"]
jobs:
  publish:
    uses: rainlanguage/rainix/.github/workflows/publish-soldeer.yaml@main
    secrets: inherit

The package name defaults to ${GITHUB_REPOSITORY##*/} with . → -, since soldeer rejects . in package names. An optional package_name input is exposed for the rare case where the registry name diverges.

Test plan

• After merge, replace rain.solmem's bespoke workflow with the wrapper (separate PR) and bump to v0.1.2 to confirm end-to-end.
• Roll out to other rain.* repos as part of the soldeer migration tracked under rain.solmem#194.

🤖 Generated with Claude Code

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📒 Files selected for processing (2)

• .github/workflows/publish-soldeer.yaml
• README.md

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• Create PR with unit tests
• Commit unit tests in branch 2026-05-09-publish-soldeer-reusable

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