feat: support to pass env vars during build stage

[ion-elgreco]

No description provided.

[Copilot]

Pull Request Overview

This PR adds support for passing environment variables to the build stage.

• Bumped project version in pyproject.toml.
• Introduced a new build_envs parameter in build_and_push to pass environment variables for docker build.
• Updated configuration, deployment, and documentation to include support for specifying docker environment variables.

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pyproject.toml	Bumped project version for the new feature.
dagster_uc/utils.py	Added build_envs parameter and its handling for docker build.
dagster_uc/manage_user_code_deployments.py	Updated function calls to include build_envs from configuration.
dagster_uc/config.py	Added docker_env_vars attribute to the configuration.
Readme.md	Documented example environment variables for the build process.