ci: Allow flags board workflow to inherit secrets

[marandaneto]

💡 Motivation and Context

The feature flags project-board caller sometimes failed CI around Semgrep's broad secrets: inherit finding. Replacing it with explicit secret mapping caused GitHub to reject the reusable workflow at startup because the central .github workflow does not declare workflow_call.secrets.

This keeps the required inheritance for that reusable workflow and documents the Semgrep exception inline.

💚 How did you test it?

• Parsed .github/workflows/call-flags-project-board.yml with PyYAML and verified secrets resolves to inherit.
• Ran git diff --check.
• Ran Semgrep locally with a rule matching secrets: inherit and verified # nosemgrep suppresses the intentional exception.
• Ran the PostHog .github Semgrep rules locally against the workflow file.

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• I updated the docs if needed.
• No breaking change or entry added to the changelog.

If releasing new changes

• Ran sampo add to generate a changeset file

🤖 Agent context

Autonomy: Human-driven (agent-assisted)

Pi investigated the failing workflow behavior, confirmed explicit secret mapping is incompatible with the pinned central reusable workflow, and kept secrets: inherit as the required GitHub Actions configuration while adding a scoped Semgrep suppression with context for reviewers.

[greptile-apps]

_{Reviews (1): Last reviewed commit: "ci: allow flags board workflow secrets i..." | Re-trigger Greptile}

[github-actions]

posthog-python Compliance Report

Date: 2026-07-01 09:24:07 UTC
Duration: 176180ms

✅ All Tests Passed!

45/45 tests passed

---

Capture Tests

✅ 29/29 tests passed

View Details

Test	Status	Duration
Format Validation.Event Has Required Fields	✅	517ms
Format Validation.Event Has Uuid	✅	1507ms
Format Validation.Event Has Lib Properties	✅	1507ms
Format Validation.Distinct Id Is String	✅	1506ms
Format Validation.Token Is Present	✅	1507ms
Format Validation.Custom Properties Preserved	✅	1507ms
Format Validation.Event Has Timestamp	✅	1506ms
Retry Behavior.Retries On 503	✅	9519ms
Retry Behavior.Does Not Retry On 400	✅	3504ms
Retry Behavior.Does Not Retry On 401	✅	3509ms
Retry Behavior.Respects Retry After Header	✅	9511ms
Retry Behavior.Implements Backoff	✅	23531ms
Retry Behavior.Retries On 500	✅	7500ms
Retry Behavior.Retries On 502	✅	7516ms
Retry Behavior.Retries On 504	✅	7508ms
Retry Behavior.Max Retries Respected	✅	23522ms
Deduplication.Generates Unique Uuids	✅	1507ms
Deduplication.Preserves Uuid On Retry	✅	7516ms
Deduplication.Preserves Uuid And Timestamp On Retry	✅	14519ms
Deduplication.Preserves Uuid And Timestamp On Batch Retry	✅	7508ms
Deduplication.No Duplicate Events In Batch	✅	1502ms
Deduplication.Different Events Have Different Uuids	✅	1508ms
Compression.Sends Gzip When Enabled	✅	1506ms
Batch Format.Uses Proper Batch Structure	✅	1506ms
Batch Format.Flush With No Events Sends Nothing	✅	1005ms
Batch Format.Multiple Events Batched Together	✅	1504ms
Error Handling.Does Not Retry On 403	✅	3508ms
Error Handling.Does Not Retry On 413	✅	3509ms
Error Handling.Retries On 408	✅	7513ms

Feature_Flags Tests

✅ 16/16 tests passed

View Details

Test	Status	Duration
Request Payload.Request With Person Properties Device Id	✅	1003ms
Request Payload.Flags Request Uses V2 Query Param	✅	1006ms
Request Payload.Flags Request Hits Flags Path Not Decide	✅	1006ms
Request Payload.Flags Request Omits Authorization Header	✅	1006ms
Request Payload.Token In Flags Body Matches Init	✅	1006ms
Request Payload.Groups Round Trip	✅	1007ms
Request Payload.Groups Default To Empty Object	✅	1006ms
Request Payload.Person Properties Distinct Id Auto Populated When Caller Omits It	✅	1006ms
Request Payload.Disable Geoip False Propagates As Geoip Disable False	✅	1006ms
Request Payload.Disable Geoip Omitted Defaults To False	✅	1006ms
Request Payload.Flag Keys To Evaluate Contains Only Requested Key	✅	1006ms
Request Lifecycle.No Flags Request On Init Alone	✅	503ms
Request Lifecycle.No Flags Request On Normal Capture	✅	1507ms
Request Lifecycle.Two Flag Calls Produce Two Remote Requests	✅	1010ms
Request Lifecycle.Mock Response Value Is Returned To Caller	✅	1002ms
Side Effect Events.Get Feature Flag Captures Feature Flag Called Event	✅	1509ms

[ioannisj]

Trust that this is safe to do