Fix release workflow

[ethanrous]

No description provided.

[Copilot]

Pull request overview

Fixes the release GitHub Actions workflow by scoping AGNO_BUILD_VERSION to a job where the version output is actually available, avoiding invalid steps.* references at the workflow/global env level.

Changes:

• Removed AGNO_BUILD_VERSION from the top-level workflow env (where steps.version.outputs.tag is not in scope).
• Added AGNO_BUILD_VERSION: ${{ needs.version.outputs.tag }} to the release job environment.

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