Drop docker_cmd for graymatter performance

[tomusdrw]

Summary

• Drop docker_cmd from graymatter-performance.yml; the graymatter image rejects the legacy fuzz-m1-target CLI args and reads JAM_FUZZ_SOCK_PATH etc. from env vars (added in Pass standard target packaging env vars to targets #33).
• Make docker_cmd optional (default "") in reusable-picofuzz.yml, matching the change applied to demo-source.yml in Drop docker_cmd for graymatter; rely on JAM_FUZZ_* env vars #35.

Mirrors #35 for the performance job.

Test plan

• Confirm scheduled Performance: graymatter workflow run starts the target with no CLI args and completes minifuzz + picofuzz suites.
• Confirm other targets' performance workflows (which still set docker_cmd) are unaffected.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Updated continuous integration workflows to improve build configuration flexibility.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 9cbf6326-ce5b-4254-b60c-4d0bf736d3b0

📥 Commits

Reviewing files that changed from the base of the PR and between 12a0738 and e13ebe5.

📒 Files selected for processing (2)

• .github/workflows/graymatter-performance.yml
• .github/workflows/reusable-picofuzz.yml

💤 Files with no reviewable changes (1)

• .github/workflows/graymatter-performance.yml

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📝 Walkthrough

Walkthrough

The docker_cmd input parameter in the reusable picofuzz workflow was made optional with an empty string default and updated description. The graymatter-performance workflow was updated to remove the explicit passing of this parameter, relying on the new default behavior.

Changes

Workflow Configuration Update

Layer / File(s)	Summary
Reusable Workflow Parameter .github/workflows/reusable-picofuzz.yml	docker_cmd input changed from required: true to required: false with default: "" and expanded description noting placeholder behavior and environment-based reads.
Consumer Workflow Integration .github/workflows/graymatter-performance.yml	Removed the explicit docker_cmd input passing from the reusable workflow invocation, allowing the default empty value to be used.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• FluffyLabs/jam-testing#35: Both PRs make the docker_cmd input optional and remove/stop passing docker_cmd for graymatter workflows.
• FluffyLabs/jam-testing#28: Both PRs modify usage of the same reusable workflow input docker_cmd (one makes it optional/removes an invocation; the other changes the argument value passed).

Poem

🐰 Once rigid and stern, now docker_cmd bends,
Optional whispers through workflows and friends,
A default so gentle, an empty string's grace,
Flexibility blooms in the CI/CD space! 🌱

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: removing docker_cmd from the graymatter performance workflow.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch graymatter-performance-no-cmd

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