feat(cli): fully deprecate template build command (v1)

[mishushakov]

Summary

• Strips all v1 build logic from `e2b template build` (`bd`): Docker build/push, API calls, config-loading, and retry/proxy handling are removed
• The command now only displays the existing yellow deprecation warning (pointing to the v2 migration guide) and exits with code 1
• Deletes `buildWithProxy.ts` which is no longer referenced anywhere
• Moves `getDockerfile` helper (used by `template create` and `template migrate`) to a new shared `dockerfile.ts` module, leaving `build.ts` as a clean stub

Test plan

• Run `e2b template build` — confirm deprecation warning is shown and the command exits immediately
• Run `e2b template create` and `e2b template migrate` — confirm they still work (both use the moved `getDockerfile` helper)

🤖 Generated with Claude Code

[cursor]

PR Summary

Medium Risk
Breaking CLI behavior for anyone still relying on v1 template build; v2 create/migrate paths are unchanged aside from the shared helper move.

Overview
e2b template build (bd) no longer runs the v1 Docker/API flow; it only prints the v2 migration deprecation box and exits with code 1. buildWithProxy.ts is removed and unused deps (command-exists, strip-ansi) are dropped from @e2b/cli.

getDockerfile moves to dockerfile.ts; template create and template migrate import it from there. Root help and README now point at e2b template create instead of template build.

Scripts or docs that still call e2b template build expecting a real build will fail until they switch to e2b template create or the v2 migration path.

^{Reviewed by Cursor Bugbot for commit fa5b8a8. Bugbot is set up for automated code reviews on this repo. Configure here.}

[changeset-bot]

🦋 Changeset detected

Latest commit: fa5b8a8

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@e2b/cli	Minor

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[github-actions]

Package Artifacts

Built from eb5211b. Download artifacts from this workflow run.

JS SDK (e2b@2.27.2-mishushakov-deprecate-template-build-cmd.0):

npm install ./e2b-2.27.2-mishushakov-deprecate-template-build-cmd.0.tgz

CLI (@e2b/cli@2.10.4-mishushakov-deprecate-template-build-cmd.0):

npm install ./e2b-cli-2.10.4-mishushakov-deprecate-template-build-cmd.0.tgz

Python SDK (e2b==2.25.1+mishushakov-deprecate-template-build-cmd):

pip install ./e2b-2.25.1+mishushakov.deprecate.template.build.cmd-py3-none-any.whl

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