chore: Add github workflows

.github/changeset-version.mjs

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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("npm install");

.github/workflows/main.yml

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+name: CI
+on:
+  push:
+    branches:
+      - "**"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: oven-sh/setup-bun@v2
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 18.x
+          cache: "bun"
+
+      - run: bun install --no-frozen-lockfile
+      - run: bun run build

.github/workflows/publish.yml

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+name: Publish
+on:
+  workflow_run:
+    workflows: ["CI"]
+    types:
+      - completed
+    branches:
+      - main
+
+concurrency: ${{ github.workflow }}-${{ github.ref }}
+
+jobs:
+  publish:
+    if: ${{ github.event.workflow_run.conclusion == 'success' }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: oven-sh/setup-bun@v2
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 18.x
+          cache: "bun"
+
+      - name: Install bun Dependencies
+        run: bun install --no-frozen-lockfile
+
+      - name: Build the package
+        run: bun build
+
+      - name: Create Release Pull Request or Publish
+        id: changesets
+        uses: changesets/action@v1
+        with:
+          commit: "chore(release): version packages"
+          title: "chore(release): version packages"
+          version: node .github/changeset-version.mjs
+          publish: npx changeset publish
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}