Add CI publish step (#30)

* Add prepare step

* Add changelog entry

* Clean & build before release

* Finalise

.github/workflows/publish.yml

@@ -0,0 +1,27 @@
+name: Publish NPM Package
+
+on:
+  release:
+    types:
+      - published
+  workflow_dispatch:
+
+jobs:
+  release:
+    name: Release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Setup
+        uses: ./.github/actions/setup
+
+      - name: Prepare release
+        run: |
+          yarn module clean
+          yarn module build
+          cd modules/@shopify/checkout-sheet-kit
+          npm publish --access public
+        env:
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}

CHANGELOG.md

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+# Changelog
+
+## 0.1.0 - January 15, 2024
+
+Initial publication of the `@shopify/checkout-sheet-kit` package.
+
+Please refer to the [Readme](./README.md) for setup intstructions and usage.
+
+---
+
+Note: breaking changes may be made during Dev Preview with minor version
+increments, but will receive a major version increments after release for
+General Availability.

docs/contributing/release.md

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+# Release
+
+The `@shopify/checkout-sheet-kit` module is published to the NPM package
+registry with public access.
+
+In order to publish a new version of the package, you must complete the
+following steps:
+
+1. Bump the version in `modules/@shopify/checkout-sheet-kit/package.json` to an
+   appropriate value.
+2. Add a [Changelog](./CHANGELOG.md) entry.
+3. Merge your PR to `main`.
+4. Create a [Release](/releases) for your new version.
+
+Creating and publishing a Github release with begin the automated process of
+publishing the latest version of the package to NPM. It will clean the module
+folder, build a new version, run `npm pack --dry-run` to verify the contents and
+publish to the NPM registry.
+
+You can follow the release action process via
+https://github.com/Shopify/checkout-sheet-kit-react-native/actions/workflows/publish.yml.