JAVASE-193 Do not run nightly builds on weekends

[tomasz-tylenda-sonarsource]

Restrict scheduled workflow runs to weekdays (Mon-Fri) to avoid unnecessary weekend builds

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[hashicorp-vault-sonar-prod]

JAVASE-193

[sonar-review-alpha]

Summary

Modifies cron schedules in two GitHub Actions workflows to run only on weekdays (Mon-Fri), eliminating unnecessary weekend builds. Updates build.yml (1:30 AM UTC) and unified-dogfooding.yml (3:00 AM UTC) by adding 1-5 to the day-of-week cron field. No changes to workflow logic or behavior—purely schedule-based filtering.

What reviewers should know

Verification: Both changes follow the same pattern (replacing * * * with * * 1-5 in day-of-week field). Cron syntax is correct: 1=Monday, 5=Friday in GitHub Actions. Scope check: Confirm these are the only scheduled workflows intended for weekday-only runs. If other nightly/scheduled workflows exist, they may need similar updates. Timezone note: Both use UTC times, so the weekday boundary matches UTC midnight, not local time. Testing: No test failures expected since this is scheduling only—no functional changes.

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[sonarqube-next]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
0 Dependency risks
No data about Coverage
0.0% Duplication on New Code

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[sonar-review-alpha]

LGTM! ✅

Minimal, correct change — both cron expressions are updated consistently and the 1-5 day-of-week field is valid GitHub Actions syntax for Monday through Friday.

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