Add daily schedule to SDK E2E test workflow

[Copilot]

Adds scheduled execution at 00:00 UTC daily to the E2E test workflow. Existing triggers (push, PR, manual dispatch, merge group) remain unchanged.

Changes:

• Added schedule trigger with cron 0 0 * * * to .github/workflows/sdk-build.yml

on:
  schedule:
    # Run once a day at 00:00 UTC
    - cron: '0 0 * * *'
  push:
    branches: [main]
  pull_request:
  workflow_dispatch:
  merge_group:

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Adjust SDK E2E Test to run once a day</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Adjust SDK E2E Test to run once a day #1

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.