Fix v2 clip image authentication and env issues

[luke-lombardi]

This pull request contains changes generated by a Cursor Cloud Agent

 

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Summary by cubic

Fixes v2 CLIP image builds by adding auth for private base images and ensuring env vars and build secrets are correctly passed to Docker builds.

• Bug Fixes

  • Use buildah --creds for both pull and bud when SourceImageCreds is provided (supports private registries).
  • Prevent build failures in multi-stage builds that require authenticated base images.

• New Features

  • Render ENV lines from BuildOpts.EnvVars in generated Dockerfiles.
  • Declare BuildSecrets as ARG in Dockerfiles and pass them via --build-arg during build.
  • Apply env/secrets handling in both appendToDockerfile and RenderV2Dockerfile paths.

^{Written for commit fecacc4. Summary will update automatically on new commits.}

[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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[cubic-dev-ai]

No issues found across 2 files