feat(container-assist): refactor multi-container workflows to YAML te…

[Tatsinnit]

Multi-Container Workflow: YAML Templates, Matrix Build & Shared Manifest

Resolves #2161, #2162, #2163

Gentle fyi @bosesuneha for testing this please.

Summary

Refactors multi-container GitHub Actions workflow generation to use external YAML template files, consolidates per-service build jobs into a single matrix strategy job, and adds a "shared manifest" UX shortcut.

Changes

#2161 — YAML Template Files

• Added 4 template files under resources/yaml/:
  • workflow-multi-header.template.yaml — top-level workflow structure (name, triggers, shared env, jobs: key)
  • workflow-multi-build-job.template.yaml — single build job with matrix strategy placeholder
  • workflow-multi-deploy-job.template.yaml — per-service deploy job (standard namespace)
  • workflow-multi-deploy-job-managed-ns.template.yaml — per-service deploy job (managed namespace)
• Refactored workflowTemplate.ts to load and substitute these files via getWorkflowYaml() instead of generating YAML from TypeScript template literals

#2162 — Matrix Build Strategy

• Replaced N separate build-<service>: jobs with a single build: job using strategy.matrix.include
• Each container contributes one matrix entry with service, docker_file, build_context, and image
• Deploy jobs use needs: [build] to depend on the unified build job

#2163 — Shared Manifest UX

• After the first service's manifest path is resolved, a QuickPick offers:
  • "Apply to all remaining services" — reuses the same manifest for all subsequent services without auto-detected manifests
  • "Choose individually" — preserves existing per-service prompting behavior
• Only shown when there are remaining services that lack auto-detected manifests

Testing

• Updated existing multi-container tests to validate matrix structure instead of per-service build jobs
• Added 3-service snapshot test suite covering: valid YAML parsing, matrix entries, deploy job dependencies, multi-manifest block scalars, and shared manifest across all services

[Copilot]

Pull request overview

This PR refactors Container Assist’s multi-container GitHub Actions workflow generation to use external YAML templates (instead of TypeScript template literals), consolidates builds into a single matrix build job, and adds a shared manifest selection shortcut during multi-container configuration collection.

Changes:

• Moved multi-container workflow rendering to resources/yaml/workflow-multi-*.template.yaml fragments and added substitution logic in workflowTemplate.ts.
• Replaced per-service build jobs with a single build job using strategy.matrix.include, while keeping per-service deploy jobs.
• Added a “Apply to all remaining services” QuickPick to reuse a manifest path across services during multi-container config collection, plus expanded unit tests (including a 3-service structural test suite).

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/commands/aksContainerAssist/workflowTemplate.ts	Loads new multi-container YAML template fragments, renders matrix include entries, and generates per-service deploy jobs via placeholder replacement.
src/commands/aksContainerAssist/workflowGenerator.ts	Adds shared-manifest QuickPick flow when manifests aren’t auto-detected for remaining services.
src/tests/suite/containerAssist/workflowTemplate.test.ts	Updates tests for matrix build + per-service deploy, and adds a 3-service structural test suite including shared-manifest assertions.
resources/yaml/workflow-multi-header.template.yaml	New multi-container workflow header fragment.
resources/yaml/workflow-multi-build-job.template.yaml	New matrix build-job fragment with MATRIX_INCLUDE placeholder.
resources/yaml/workflow-multi-deploy-job.template.yaml	New per-service deploy-job fragment (standard namespace).
resources/yaml/workflow-multi-deploy-job-managed-ns.template.yaml	New per-service deploy-job fragment (managed namespace).

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