Various improvements and fixes to setup-bun (#40)

* Do not save cache on hit
* Support Windows (canary only)
* Support `registry-url` and `scope`

.github/workflows/format.yml

@@ -0,0 +1,30 @@
+name: autofix.ci # Must be named this for autofix.ci to work
+
+on:
+  workflow_dispatch:
+  pull_request:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: read
+
+jobs:
+  format:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20.x
+      - name: Install Dependencies
+        run: npm install
+      - name: Format
+        run: |
+          npm run format
+          npm run build
+      - name: Commit
+        uses: autofix-ci/action@d3e591514b99d0fca6779455ff8338516663f7cc