feat: add JSON and shell dry-run plans for build-container

[wyli]

Summary

Add host-resolved structured dry-run output for build-container.

• --dryrun --json returns ordered probe and action steps.
• --dryrun --shell returns labeled, multiline Bash steps for copying or editing.
• Plain --dryrun remains unchanged.
• Literal credential values are redacted.

This first slice is enabled only for build-container.

Usage

holoscan build-container my_app --dryrun --json
holoscan build-container my_app --dryrun --shell

Example JSON shape:

{
  "schema_version": 1,
  "steps": [
    {"role": "probe", "argv": ["docker", "buildx", "version"]},
    {"role": "action", "argv": ["docker", "build", "..."]}
  ]
}

The plan reflects the current host and environment. Review generated shell output before running it.

Validation

445 tests passed, 1 skipped. All PR checks pass.

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Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

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