Stop merging when targetting non main system-tests ref

[nccatoni]

Motivation

Changes

Workflow

1. ⚠️ Create your PR as draft ⚠️
2. Work on you PR until the CI passes
3. Mark it as ready for review
   • Tests, manifest, weblog are modified -> you'll need a review from system-tests-reviewers: ask to one of youre co-worker familiar with the tested feature.
   • Framework is modified, or non obvious usage of it -> get a review from system-tests-core (slack)

🚀 Once your PR is reviewed and the CI green, you can merge it!

🛟 #apm-shared-testing 🛟

[github-actions]

CODEOWNERS have been resolved as:

.github/workflows/system-tests.yml                                      @DataDog/system-tests-core

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-30T16:42:58.203277Z	c075ff8	Draft marked ready

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[datadog-prod-us1-5]

 

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❌ Errors

Your PR has failed checks. Please review the issues below and take necessary action before merging.

🚦 109 Pipeline jobs failed

Testing the test | System Tests (ruby, dev) / End-to-end #1 / rails61 1 — ❌ 1 test failed · 🔧 Needs a code fix, caused by this PR

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❌ tests.ai_guard.test_ai_guard_sdk.Test_SDK_Disabled.test_sdk_disabled[rails61] from system_tests_suite

assert 500 == 200
 +  where 500 = HttpResponse(status_code:500, headers:{'X-Frame-Options': 'SAMEORIGIN', 'X-XSS-Protection': '1; mode=block', 'X-Conten...'Transfer-Encoding': 'chunked'}, text:{"error":"unknown keywords: :id, :tool_name, :arguments","type":"ArgumentError"}).status_code
 +    where HttpResponse(status_code:500, headers:{'X-Frame-Options': 'SAMEORIGIN', 'X-XSS-Protection': '1; mode=block', 'X-Conten...'Transfer-Encoding': 'chunked'}, text:{"error":"unknown keywords: :id, :tool_name, :arguments","type":"ArgumentError"}) = <tests.ai_guard.test_ai_guard_sdk.Test_SDK_Disabled object at 0x7f470023cd40>.request

self = <tests.ai_guard.test_ai_guard_sdk.Test_SDK_Disabled object at 0x7f470023cd40>

    def test_sdk_disabled(self):
        """Test AI Guard disabled by default, it should always return ALLOW and no span should be generated"""
>       assert self.request.status_code == 200
E       assert 500 == 200
...

Testing the test | System Tests (ruby, dev) / End-to-end #1 / uds-rails 1 — 🔧 Needs a code fix, caused by this PR

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Testing the test | all-jobs-are-green — 🔧 Needs a code fix, caused by this PR

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View all 109 failed jobs.

ℹ️ Info

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❄️ No new flaky tests detected

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