ci: add release workflow

.github/changeset-version.js

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+// 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("pnpm install");

.github/workflows/release.yml

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+name: Release
+
+on:
+  push:
+    branches:
+      - main
+
+env:
+  STORE_PATH: ""
+
+jobs:
+  release:
+    if: ${{ github.repository_owner == 'lmsqueezy' }}
+    name: "Create Release Pull Request or Publish to npm"
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Install Bun
+        uses: oven-sh/setup-bun@v1
+        with:
+          bun-version: "latest"
+
+      - name: Cache Bun dependencies
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.bun
+            bun.lockb
+          key: ${{ runner.os }}-bun-${{ hashFiles('**/bun.lockb') }}
+          restore-keys: |
+            ${{ runner.os }}-bun-
+
+      - name: Install dependencies
+        run: bun install
+
+      - name: Build the package
+        run: bun run build
+
+      - name: Publish to NPM
+        id: changesets
+        uses: changesets/[email protected]
+        with:
+          commit: "chore(release): version packages"
+          title: "chore(release): version packages"
+          version: node .github/changeset-version.js
+          publish: npx changeset publish
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
+          NODE_ENV: "production"