setup bun with env BUN_VERSION

.github/workflows/action-env.yml

@@ -0,0 +1,33 @@
+name: Setup Bun with env BUN_VERSION
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+  workflow_dispatch:
+jobs:
+  setup-bun:
+    runs-on: ${{ matrix.os }}
+    continue-on-error: true
+    strategy:
+      matrix:
+        os:
+          - ubuntu-latest
+          - macos-latest
+        bun-version:
+          - "0.5.6"
+    steps:
+      - id: checkout
+        name: Checkout
+        uses: actions/checkout@v3
+      - id: setup-bun
+        name: Setup Bun
+        uses: ./
+        env:
+          BUN_VERSION: ${{ matrix.bun-version }}
+      - id: verify-bun
+        name: Verify Bun
+        run: |
+          bun --version

src/action.ts

@@ -7,7 +7,8 @@ if (!process.env.RUNNER_TEMP) {
 }
 
 setup({
-  version: action.getInput("bun-version") || undefined,
+  version:
+    process.env.BUN_VERSION || action.getInput("bun-version") || undefined,
   customUrl: action.getInput("bun-download-url") || undefined,
 })
   .then(({ version, cacheHit }) => {