ci: reuse system-tests runner image

[bm1549]

Description

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System-test jobs currently spend about 4m18s on recursive submodules and about 5 minutes installing Docker and Python tooling. This moves them to the upstream system-tests runner image, disables dd-trace-php submodules for these jobs, reuses the image virtualenv, and builds only the PHP weblog.

Each pipeline resolves system-tests/main once in prepare code and passes that exact SHA to every system-test job through a dotenv artifact. This keeps upstream source drift between pipelines without letting parallel jobs within one pipeline use different revisions.

The runner stays content-addressed at ci-runner:75a57a4b6391. Each job performs an exact shallow checkout, then runs the upstream build_ci_image.py --check-only check before fetching Docker Hub or Datadog credentials. A change to the upstream runner Dockerfile or requirements.txt fails early until this repository advances the image tag. Parent YAML defaults are moved into the generated child pipeline so the system-test override cannot be outranked by trigger variables.

Expected impact: about 9m18s less wall time per executing job, roughly 2h38m of executor time across 17 routine expansions, or 6h31m when all 42 expansions run. Shallow-checkout savings are not included.

Tested with:

• Fresh system-tests/main checkout and source/image hash match
• Generated-pipeline contract for main resolution, dotenv propagation, exact checkout, and image validation
• Runner tool, virtualenv, default, alternate-weblog, tracer-release, and parametric probes
• Generated package YAML: 30 definitions / 42 expansions with unchanged matrices
• Trigger precedence, artifacts, failure propagation, PHP lint, and git diff --check

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[datadog-prod-us1-5]

 

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⚠️ Warnings

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

🚦 4 Pipeline jobs failed

DataDog/apm-reliability/dd-trace-php | test_extension_ci: [8.1] — 🔧 Needs a code fix, caused by this PR

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DataDog/apm-reliability/dd-trace-php | bundle for reliability env

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DataDog/apm-reliability/dd-trace-php | merge-gate

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ℹ️ Info

No other issues found (see more)

🧪 All tests passed
❄️ No new flaky tests detected

🔄 Datadog auto-retried 2 jobs - 0 passed on retry

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 60.60% (-0.03%)

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