[DO NOT MERGE] Build CheCode editor image to test PR-363

[vrubezhny]

What does this PR do?

Opened to create a CheCode editor image to test:

eclipse-che/che-machine-exec#363

What issues does this PR fix?

How to test this PR?

Does this PR contain changes that override default upstream Code-OSS behavior?

• the PR contains changes in the code folder (you can skip it if your changes are placed in a che extension )
• the corresponding items were added to the CHANGELOG.md file
• rules for automatic git rebase were added to the .rebase folder

Summary by CodeRabbit

• Bug Fixes
  • Improved startup and initialization of the machine execution service.
  • Added support for machine execution binaries across UBI 8, UBI 9, and musl environments.
  • Updated shared runtime volume setup to include the required CheCode components.
  • Improved execution reliability by starting the service from its correct runtime location.

[github-actions]

Click here to review and test in web IDE:

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[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 Plus

Run ID: f0cf958b-d37a-496e-980e-b8ddcc4c40e4

📥 Commits

Reviewing files that changed from the base of the PR and between d2d7be6 and 7acccdf.

📒 Files selected for processing (3)

• build/dockerfiles/assembly.Dockerfile
• build/scripts/entrypoint-init-container.sh
• build/scripts/entrypoint-volume.sh

💤 Files with no reviewable changes (1)

• build/scripts/entrypoint-init-container.sh

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📝 Walkthrough

Walkthrough

The machine-exec assembly now uses a PR-specific image and packages separate binaries for ubi8, ubi9, and musl under their respective checode directories. Initialization copies all /checode-* directories into the shared /checode/ volume. The volume entrypoint starts ./machine-exec later in execution with MACHINE_EXEC_PORT=3333, replacing the earlier /checode/bin/machine-exec launch.

Estimated code review effort: 2 (Simple) | ~10 minutes

Sequence Diagram(s)

sequenceDiagram
  participant MachineExecImage
  participant RootfsAssembly
  participant InitContainer
  participant ChecodeVolume
  participant VolumeEntrypoint
  participant MachineExec

  MachineExecImage->>RootfsAssembly: Supply che-machine-exec binaries
  RootfsAssembly->>ChecodeVolume: Populate distribution-specific checode directories
  InitContainer->>ChecodeVolume: Copy /checode-* content into /checode/
  VolumeEntrypoint->>MachineExec: Start ./machine-exec with MACHINE_EXEC_PORT=3333
  MachineExec->>ChecodeVolume: Run from the selected checode directory

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Suggested reviewers: azatsarynnyy, rgrunber, vitaliy-guliy

🚥 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 is concise, imperative, and clearly describes building a CheCode editor image to test PR-363.
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.
Rebase Rules For Upstream Changes	✅ Passed	HEAD only changes build/dockerfiles/assembly.Dockerfile; no files under code/ (excluding che extensions/locks) were modified, so no rebase rules/changelog are required.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[github-actions]

Pull Request images published ✨

Editor amd64: quay.io/che-incubator-pull-requests/che-code:pr-769-amd64
Editor arm64: quay.io/che-incubator-pull-requests/che-code:pr-769-arm64
Dev image: quay.io/che-incubator-pull-requests/che-code-dev:pr-769-dev-amd64