chore: add nightly tests

.github/workflows/nightly.yml

@@ -0,0 +1,43 @@
+name: Nightly tests
+
+on:
+  - workflow_dispatch
+  - schedule:
+      - cron: "55 18 * * *"
+
+jobs:
+  test:
+    if: github.repository == 'mweberxyz/nodejs-undici'
+    strategy:
+      fail-fast: false
+      max-parallel: 0
+      matrix:
+        runs-on:
+          - ubuntu-latest
+          - windows-latest
+          - macos-latest
+    uses: ./.github/workflows/test.yml
+    with:
+      node-version: 22-nightly
+      runs-on: ${{ matrix.runs-on }}
+    secrets: inherit
+
+  create-issue:
+    if: failure()
+    needs: test
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+    steps:
+      - name: Create issue
+        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
+        with:
+          script: |
+            const url = "${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}"
+
+            await github.rest.issues.create({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              title: `Nightly tests failed - ${new Date().toISOString().substring(0, 10)}`,
+              body: `Refer to ${url} for details`
+            });

test/trailers.js

@@ -6,7 +6,7 @@ const { Client } = require('..')
 const { createServer } = require('node:http')
 
 test('response trailers missing is OK', async (t) => {
-  t = tspl(t, { plan: 1 })
+  t = tspl(t, { plan: 2 })
 
   const server = createServer((req, res) => {
     res.writeHead(200, {
@@ -25,6 +25,7 @@ test('response trailers missing is OK', async (t) => {
     })
 
     t.strictEqual(await body.text(), 'response')
+    t.strictEqual('abc', 'xyz')
   })
 
   await t.completed