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/test.yml

@@ -0,0 +1,65 @@
+name: Test
+
+on:
+  workflow_dispatch:
+  pull_request:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: read
+
+jobs:
+  setup-bun:
+    runs-on: ${{ matrix.os }}
+    continue-on-error: true
+    strategy:
+      matrix:
+        include:
+          - os: windows-latest
+            bun-version: canary
+        os:
+          - ubuntu-latest
+          - macos-latest
+        bun-version:
+          - latest
+          - canary
+          - "0.8.1" # last version before 1.0
+          - "0.x"
+          - "1.0.0"
+          - "1.x"
+          - "1"
+          - "> 1.0.0"
+          - "< 2"
+          # Disable <sha> support for now. This is because Github Artifacts
+          # expire after 90 days, and we don't have another source of truth yet.
+          # - "822a00c4d508b54f650933a73ca5f4a3af9a7983" # 1.0.0 commit
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Setup Bun
+        uses: ./
+        with:
+          bun-version: ${{ matrix.bun-version }}
+      - name: Run Bun
+        run: |
+          bun --version
+  setup-bun-from-package-json-version:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os:
+          - ubuntu-latest
+          - macos-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Setup package.json
+        run: |
+          echo "$(jq '. += {"packageManager": "bun@1.0.0"}' package.json)" > package.json
+      - name: Setup Bun
+        uses: ./
+      - name: Run Bun
+        run: |
+          bun --version