add github action to automate versioning and publishing

.github/scripts/changeset-version.js

@@ -0,0 +1,12 @@
+// WITH THANKS TO SHADCN, ORIGINALLY FROM CLOUDFLARE WRANGLER:
+// https://github.com/cloudflare/wrangler2/blob/main/.github/changeset-version.js
+
+import { exec } from "child_process"
+
+// This script is used by the `release.yml` workflow to update the version of the packages being released.
+// The standard step is only to run `changeset version` but this does not update the package-lock.json file.
+// So we also run `npm install`, which does this update.
+// This is a workaround until this is handled automatically by `changeset version`.
+// See https://github.com/changesets/changesets/issues/421.
+exec("npx changeset version")
+exec("npm install")

.github/workflows/release.yml

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+# Adapted from shadcn/ui
+
+name: Release
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Use PNPM
+        uses: pnpm/action-setup@v4
+        with:
+          version: 9.0.6
+
+      - name: Use node.js 18
+        uses: actions/setup-node@v4
+        with:
+          node-version: 18
+          cache: "pnpm"
+
+      - name: Install dependencies
+        run: pnpm install
+
+      - name: Build
+        run: pnpm build
+
+      - name: Create publish PR or publish directly
+        id: changesets
+        uses: changesets/action@v1.4.1
+        with:
+          commit: "chore(release): version release"
+          title: "chore(release): version release"
+          version: node .github/scripts/changeset-version.js
+          publish: npx changeset publish
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
+          NODE_ENV: production