ci: enable cron for environment clean up

[joshblack]

Updates our environment clean up command so that it runs every night at midnight

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Pull request overview

Enables a nightly scheduled run for the existing “environments” GitHub Actions workflow, so the environment cleanup job runs automatically in addition to manual dispatch.

Changes:

• Uncommented/added a schedule trigger intended to run at midnight daily.
• Kept workflow_dispatch to allow manual execution.

Show a summary per file

File	Description
.github/workflows/environment.yml	Enables a cron schedule trigger for nightly environment cleanup.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 1
• Review effort level: Low

[jonrohan]

:jinx:

[primer]

🤖 Formatting issues have been automatically fixed and committed to this PR.