Gate crates.io publish job to version tags only

[Copilot]

The publish GitHub Actions job was failing on regular main pushes because it attempted cargo publish outside an explicit release flow. This change scopes publishing to version-tag pushes (v*) while keeping the existing build/test workflow behavior.

• Workflow trigger scope

  • Added tag-based push trigger to the Rust workflow:
    • push.tags: ["v*"]

• Publish job gating

  • Updated publish job condition from refs/heads/main to refs/tags/v*.
  • Result: publish is attempted only for release tags, not every push to main.

on:
  push:
    branches: ["main"]
    tags: ["v*"]

jobs:
  publish:
    if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/v')

[vimlinuz]

Doesn't actually resolves the issues though good catch