Add mock Build-Engine for CI

[FyreByrd]

I am opening this draft PR for us all to work on, since I don't know how to do all this, and the rest of y'all have bits of important knowledge.

Per the discussion in Discord:

• Mock BuildEngine
• Mock CodeBuild???

Feel free to add to this

Summary by CodeRabbit

• Chores
  • Updated the continuous integration workflow by removing an obsolete SSH tunnel setup and replacing it with a non-operational placeholder step. This streamlines the pipeline and reduces reliance on environment secrets. No changes to application features or performance. Deployment behavior remains unchanged, with no runtime impact for end-users.

[coderabbitai]

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Walkthrough

The CI workflow step "Setup stg-tunnel" in .github/workflows/main.yml is renamed to "Setup Mock Build-Engine." The SSH tunnel setup, related commands, and environment secrets are removed and replaced with placeholder comments, eliminating any SSH/stg-tunnel operations from the workflow.

Changes

Cohort / File(s)	Summary
CI Workflow .github/workflows/main.yml	Renamed step from "Setup stg-tunnel" to "Setup Mock Build-Engine"; removed SSH key handling, SSH tunnel commands, and env secrets; added non-functional placeholder content.

Sequence Diagram(s)

sequenceDiagram
  autonumber
  actor Dev as Developer
  participant GH as GitHub Actions Runner
  participant Step as Workflow Step

  Dev->>GH: Push/PR triggers workflow
  GH->>Step: Execute "Setup Mock Build-Engine"
  Note over Step: Placeholder content only<br/>No SSH keys, no tunnel
  Step-->>GH: Complete without external connections
  GH-->>Dev: Continue remaining jobs

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Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

I nibbled the tunnel—snip! it’s gone,
A mocky block I’m hopping on.
No keys to guard, no ports to mend,
Just placeholder winds that softly wend.
CI still hums, the carrots cheer—
Onward builds, the path is clear! 🥕

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The title "Add mock Build-Engine for CI" accurately and concisely reflects the primary change in .github/workflows/main.yml, where the previous "Setup stg-tunnel" CI step was renamed and replaced with a non-functional "Setup Mock Build-Engine" placeholder; it is specific and meaningful for reviewers scanning PR history.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.

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