ci: drop cron schedule — push to main covers release

[chubes4]

Summary

• Remove schedule: '*/15 * * * *' cron trigger
• Push to main already triggers the release pipeline via homeboy-action
• Eliminates 96 unnecessary CI runs per day

Same change as Extra-Chill/data-machine#927.

[homeboy-ci]

Homeboy Results — data-machine-events

Homeboy

⚡ Scope: changed files only

✅ audit (changed files only)

✅ lint (changed files only)

✅ test (changed files only)

Tooling versions

• Homeboy CLI: homeboy 0.85.0+75dcf3f
• Extension: wordpress from https://github.com/Extra-Chill/homeboy-extensions
• Extension revision: unknown
• Action: Extra-Chill/homeboy-action@v2

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Homeboy Action v1