feat(apps:builds:create): support ad hoc environment variables

[robingenz]

Summary

• Add --variable flag (repeatable KEY=VALUE) to pass ad hoc environment variables when creating a build
• Add --variable-file flag to load ad hoc environment variables from a .env file
• Variables are sent as adHocEnvironmentVariables in the API request body

[Copilot]

Pull request overview

Adds support for passing ad hoc environment variables when creating an app build via the CLI, and forwards them to the API as adHocEnvironmentVariables.

Changes:

• Extend CreateAppBuildDto with optional adHocEnvironmentVariables.
• Add --variable (repeatable KEY=VALUE) and --variable-file (simple .env-style) flags to apps builds create.
• Parse/merge file + inline variables and include them in the build create request body.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/types/app-build.ts	Adds adHocEnvironmentVariables?: Record<string, string> to the build creation DTO.
src/commands/apps/builds/create.ts	Introduces new CLI flags, parses variables from inline/file, and sends them to appBuildsService.create().

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