ci: change nightly to run in UTC time to fix nightly-status check

[jordanrfrazier]

Nightly builds ran at 06:30 UTC. check-nightly-status checked that the day the PR ran was the same day the latest nightly was published. Thus, there was a window where the latest published nightly was from the "day before" from the perspective of the PR, but that's just because the workflow hadn't run yet for the (UTC-based) day.

This PR changes the nightly to run in UTC time. Seems more standard.

Summary by CodeRabbit

• Chores
  • Updated the nightly build schedule to run daily at midnight UTC.

[coderabbitai]

Walkthrough

The scheduled time for the nightly build GitHub Actions workflow was changed from 6:30 UTC to 00:00 UTC. No other modifications were made to the workflow's logic, environment, or steps.

Changes

File	Change Summary
.github/workflows/nightly_build.yml	Updated cron schedule from 6:30 UTC to 00:00 UTC

---

📜 Recent review details

Configuration used: .coderabbit.yaml
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 24e7acf and 4c570de.

📒 Files selected for processing (1)

• .github/workflows/nightly_build.yml (1 hunks)

🔇 Additional comments (1)

.github/workflows/nightly_build.yml (1)

6-7: ```shell
#!/bin/bash

List all workflow files to confirm the presence and naming of any "check-nightly-status" workflow

echo "Workflow files in .github/workflows/:"
ls .github/workflows/.yml .github/workflows/.yaml || true
echo

Search for any cron or schedule entries across all workflows

echo "Cron entries found:"
rg -n "cron:" .github/workflows
echo
echo "Schedule entries found:"
rg -n "schedule:" .github/workflows

</details>

</blockquote></details>

</details>
<!-- internal state start -->


<!-- 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= -->

<!-- internal state end -->
<!-- finishing_touch_checkbox_start -->

<details open="true">
<summary>✨ Finishing Touches</summary>

<details open="true">
<summary>🧪 Generate Unit Tests</summary>

- [ ] <!-- {"checkboxId": "f47ac10b-58cc-4372-a567-0e02b2c3d479", "radioGroupId": "utg-output-choice-group-unknown_comment_id"} -->   Create PR with Unit Tests
- [ ] <!-- {"checkboxId": "07f1e7d6-8a8e-4e23-9900-8731c2c87f58", "radioGroupId": "utg-output-choice-group-unknown_comment_id"} -->   Post Copyable Unit Tests in Comment
- [ ] <!-- {"checkboxId": "6ba7b810-9dad-11d1-80b4-00c04fd430c8", "radioGroupId": "utg-output-choice-group-unknown_comment_id"} -->   Commit Unit Tests in branch `fix-nightly-tz`

</details>

</details>

<!-- finishing_touch_checkbox_end -->
<!-- tips_start -->

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

<details>
<summary>❤️ Share</summary>

- [X](https://twitter.com/intent/tweet?text=I%20just%20used%20%40coderabbitai%20for%20my%20code%20review%2C%20and%20it%27s%20fantastic%21%20It%27s%20free%20for%20OSS%20and%20offers%20a%20free%20trial%20for%20the%20proprietary%20code.%20Check%20it%20out%3A&url=https%3A//coderabbit.ai)
- [Mastodon](https://mastodon.social/share?text=I%20just%20used%20%40coderabbitai%20for%20my%20code%20review%2C%20and%20it%27s%20fantastic%21%20It%27s%20free%20for%20OSS%20and%20offers%20a%20free%20trial%20for%20the%20proprietary%20code.%20Check%20it%20out%3A%20https%3A%2F%2Fcoderabbit.ai)
- [Reddit](https://www.reddit.com/submit?title=Great%20tool%20for%20code%20review%20-%20CodeRabbit&text=I%20just%20used%20CodeRabbit%20for%20my%20code%20review%2C%20and%20it%27s%20fantastic%21%20It%27s%20free%20for%20OSS%20and%20offers%20a%20free%20trial%20for%20proprietary%20code.%20Check%20it%20out%3A%20https%3A//coderabbit.ai)
- [LinkedIn](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Fcoderabbit.ai&mini=true&title=Great%20tool%20for%20code%20review%20-%20CodeRabbit&summary=I%20just%20used%20CodeRabbit%20for%20my%20code%20review%2C%20and%20it%27s%20fantastic%21%20It%27s%20free%20for%20OSS%20and%20offers%20a%20free%20trial%20for%20proprietary%20code)

</details>

<details>
<summary>🪧 Tips</summary>

### Chat

There are 3 ways to chat with [CodeRabbit](https://coderabbit.ai?utm_source=oss&utm_medium=github&utm_campaign=langflow-ai/langflow&utm_content=8629):

- Review comments: Directly reply to a review comment made by CodeRabbit. Example:
  - `I pushed a fix in commit <commit_id>, please review it.`
  - `Explain this complex logic.`
  - `Open a follow-up GitHub issue for this discussion.`
- Files and specific lines of code (under the "Files changed" tab): Tag `@coderabbitai` in a new review comment at the desired location with your query. Examples:
  - `@coderabbitai explain this code block.`
  -	`@coderabbitai modularize this function.`
- PR comments: Tag `@coderabbitai` in a new PR comment to ask questions about the PR branch. For the best results, please provide a very specific query, as very limited context is provided in this mode. Examples:
  - `@coderabbitai gather interesting stats about this repository and render them as a table. Additionally, render a pie chart showing the language distribution in the codebase.`
  - `@coderabbitai read src/utils.ts and explain its main purpose.`
  - `@coderabbitai read the files in the src/scheduler package and generate a class diagram using mermaid and a README in the markdown format.`
  - `@coderabbitai help me debug CodeRabbit configuration file.`

### Support

Need help? Create a ticket on our [support page](https://www.coderabbit.ai/contact-us/support) for assistance with any issues or questions.

Note: Be mindful of the bot's finite context window. It's strongly recommended to break down tasks such as reading entire modules into smaller chunks. For a focused discussion, use review comments to chat about specific files and their changes, instead of using the PR comments.

### CodeRabbit Commands (Invoked using PR comments)

- `@coderabbitai pause` to pause the reviews on a PR.
- `@coderabbitai resume` to resume the paused reviews.
- `@coderabbitai review` to trigger an incremental review. This is useful when automatic reviews are disabled for the repository.
- `@coderabbitai full review` to do a full review from scratch and review all the files again.
- `@coderabbitai summary` to regenerate the summary of the PR.
- `@coderabbitai generate docstrings` to [generate docstrings](https://docs.coderabbit.ai/finishing-touches/docstrings) for this PR.
- `@coderabbitai generate sequence diagram` to generate a sequence diagram of the changes in this PR.
- `@coderabbitai auto-generate unit tests` to generate unit tests for this PR.
- `@coderabbitai resolve` resolve all the CodeRabbit review comments.
- `@coderabbitai configuration` to show the current CodeRabbit configuration for the repository.
- `@coderabbitai help` to get help.

### Other keywords and placeholders

- Add `@coderabbitai ignore` anywhere in the PR description to prevent this PR from being reviewed.
- Add `@coderabbitai summary` to generate the high-level summary at a specific location in the PR description.
- Add `@coderabbitai` anywhere in the PR title to generate the title automatically.

### Documentation and Community

- Visit our [Documentation](https://docs.coderabbit.ai) for detailed information on how to use CodeRabbit.
- Join our [Discord Community](http://discord.gg/coderabbit) to get help, request features, and share feedback.
- Follow us on [X/Twitter](https://twitter.com/coderabbitai) for updates and announcements.

</details>

<!-- tips_end -->