Fixing the version artifact upload from release.yml

[yash-dodderi7]

Related Issue

Resolves:
https://jira.issues.couchbase.com/browse/CBD-6781
https://jira.issues.couchbase.com/browse/DA-1987

What does this change do?

This is to ensure that the version artifacts are uploaded in the release.yml actions as well

Why is this change needed?

This is to ensure that the docker.yml is able to obtain the versions artifacts from release.yml actions

Evidence of Testing

Automated tests — commands run and results summary:

# e.g. uv run pytest tests/unit/  →  142 passed
# e.g. uv run pytest tests/integration/  →  38 passed, 2 skipped

Environments tested (both are required):

• Couchbase Capella (version: ____)
• Self-managed Couchbase Server (version: ____, e.g. via Docker)

Manual verification — MCP client used (Claude Desktop, Cursor, MCP Inspector, ...) and what was exercised. Screenshots or tool-call transcripts are very helpful:

Compatibility Considerations

Checklist

• Linked to an issue (required for new tools). The issue can be on JIRA (preferred for internal contributors) or GitHub.
• Uses the Couchbase SDK (REST fallback justified in the description, if any)
• Works on both Capella and self-managed Couchbase Server
• No changes to cb_mcp.core contracts / managed MCP interfaces (or discussed first)
• Unit tests added/updated
• Integration tests added/updated (for cluster-touching changes)
• Read-only mode and tool annotations handled (for new/changed tools)
• Evidence of testing included above
• Docs updated (README, DOCKER.md) for user-facing changes
• Lint and pre-commit pass

[Copilot]

Pull request overview

Updates the GitHub Actions release workflow to persist the resolved release version as a build artifact, enabling downstream workflows (e.g., docker.yml) triggered via workflow_run to retrieve the version consistently from the PyPI Release run.

Changes:

• Writes the resolved version string to version.txt in .github/workflows/release.yml.
• Uploads version.txt as the release-version artifact from the PyPI Release workflow run.

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