chore: run required checks on docs-only PRs

[dustinbyrne]

Problem

Required checks can remain permanently pending on docs-only PRs when the workflow that reports the required check is skipped by a PR path filter.

Changes

• Keep required-check workflows running for PRs so required status contexts are always reported.
• Reuse the shared markdown-only detector from PostHog/.github pinned to ec25337d9fae0100622cbfea1bd5bd88284ac10b.
• Scope pull-requests: read to only the detector job.
• For PRs where every changed file ends in .md, each required job runs a neutral completion step and bypasses the build/test/lint work.
• For any PR with non-.md changes, the normal CI steps still run.

How did you test this code?

• Reviewed the workflow diff.
• Ran git diff --check.
• Parsed the edited workflow YAML locally.
• Verified the copied detector implementation was removed and the shared workflow reference is pinned to the merged .github commit.

🤖 Agent context

Autonomy: Human-driven (agent-assisted)

Pi was used to apply this workflow change after markdown-only AI policy PRs exposed required checks that did not report. One subagent inspected each affected repo before implementation so the required job names and workflow structure stayed repo-specific. The common detector was then factored into PostHog/.github and referenced from this repo after that shared workflow merged.

[greptile-apps]

_{Reviews (1): Last reviewed commit: "chore: run required checks on docs-only ..." | Re-trigger Greptile}

[github-actions]

posthog-dotnet Compliance Report

Date: 2026-06-16 17:55:22 UTC
Duration: 623ms

⚠️ Some Tests Failed

2/16 tests passed, 14 failed

---

Feature_Flags Tests

⚠️ 2/16 tests passed, 14 failed

View Details

Test	Status	Duration
Request Payload.Request With Person Properties Device Id	❌	42ms
Request Payload.Flags Request Uses V2 Query Param	❌	22ms
Request Payload.Flags Request Hits Flags Path Not Decide	❌	5ms
Request Payload.Flags Request Omits Authorization Header	❌	5ms
Request Payload.Token In Flags Body Matches Init	❌	5ms
Request Payload.Groups Round Trip	❌	5ms
Request Payload.Groups Default To Empty Object	❌	5ms
Request Payload.Person Properties Distinct Id Auto Populated When Caller Omits It	❌	5ms
Request Payload.Disable Geoip False Propagates As Geoip Disable False	❌	4ms
Request Payload.Disable Geoip Omitted Defaults To False	❌	5ms
Request Payload.Flag Keys To Evaluate Contains Only Requested Key	❌	5ms
Request Lifecycle.No Flags Request On Init Alone	✅	3ms
Request Lifecycle.No Flags Request On Normal Capture	✅	182ms
Request Lifecycle.Two Flag Calls Produce Two Remote Requests	❌	7ms
Request Lifecycle.Mock Response Value Is Returned To Caller	❌	5ms
Side Effect Events.Get Feature Flag Captures Feature Flag Called Event	❌	5ms

Failures

request_payload.request_with_person_properties_device_id

404, message='Not Found', url='http://sdk-adapter:8080/get_feature_flag'

request_payload.flags_request_uses_v2_query_param

404, message='Not Found', url='http://sdk-adapter:8080/get_feature_flag'

request_payload.flags_request_hits_flags_path_not_decide

404, message='Not Found', url='http://sdk-adapter:8080/get_feature_flag'

request_payload.flags_request_omits_authorization_header

404, message='Not Found', url='http://sdk-adapter:8080/get_feature_flag'

request_payload.token_in_flags_body_matches_init

404, message='Not Found', url='http://sdk-adapter:8080/get_feature_flag'

request_payload.groups_round_trip

404, message='Not Found', url='http://sdk-adapter:8080/get_feature_flag'

request_payload.groups_default_to_empty_object

404, message='Not Found', url='http://sdk-adapter:8080/get_feature_flag'

request_payload.person_properties_distinct_id_auto_populated_when_caller_omits_it

404, message='Not Found', url='http://sdk-adapter:8080/get_feature_flag'

request_payload.disable_geoip_false_propagates_as_geoip_disable_false

404, message='Not Found', url='http://sdk-adapter:8080/get_feature_flag'

request_payload.disable_geoip_omitted_defaults_to_false

404, message='Not Found', url='http://sdk-adapter:8080/get_feature_flag'

request_payload.flag_keys_to_evaluate_contains_only_requested_key

404, message='Not Found', url='http://sdk-adapter:8080/get_feature_flag'

request_lifecycle.two_flag_calls_produce_two_remote_requests

404, message='Not Found', url='http://sdk-adapter:8080/get_feature_flag'

request_lifecycle.mock_response_value_is_returned_to_caller

404, message='Not Found', url='http://sdk-adapter:8080/get_feature_flag'

side_effect_events.get_feature_flag_captures_feature_flag_called_event

404, message='Not Found', url='http://sdk-adapter:8080/get_feature_flag'

[dustinbyrne]

will update to use PostHog/.github#54