Add Codacy code coverage reporting with simplecov-cobertura

[Copilot]

Adds Codacy code coverage reporting to the GitHub Actions CI pipeline using simplecov-cobertura for Cobertura XML format generation.

Changes

• twiglet.gemspec: Added simplecov-cobertura (> 1.4) and rexml (> 3.3.6) dependencies
• test/test_coverage.rb: Configured CoberturaFormatter for CI builds to generate coverage/coverage.xml
• .github/workflows/ruby.yml:
  • Added CODACY_PROJECT_NAME: twiglet-ruby env var
  • Added Codacy upload step (Ruby 3.4 only, continue-on-error: true)
  • Uses CODACY_PROJECT_TOKEN secret

Usage

Coverage uploads automatically on push when tests complete:

- name: Upload coverage to Codacy
  if: matrix.ruby-version == '3.4'
  continue-on-error: true
  env:
    CODACY_PROJECT_TOKEN: ${{ secrets.CODACY_PROJECT_TOKEN }}
  run: bash <(curl -Ls https://coverage.codacy.com/get.sh) report -r coverage/coverage.xml

Note: rexml pinned to ~> 3.3.6 to avoid DoS vulnerability in earlier versions while maintaining compatibility with simplecov-cobertura.

Original prompt

Can you add Codacy Code Coverage reporting to this repo in the Semaphore CI pilpeline. You will need to add simplecov with loc reporting and use the codacy secret in the pipeline.
Need the following CODACY_PROJECT_NAME to be set to the repo name of know and the command to push the coverage is bash <(curl -Ls https://coverage.codacy.com/get.sh) report -r coverage/coverage.xml
Gem to use is simplecov-cobertura

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