feat: create GitHub Release with auto-generated changelog on tag push

[Copilot]

The release workflow built Docker images on tag push but never created a GitHub Release, leaving no release artifacts or changelog on the repo's Releases page.

Changes

• New release job in .github/workflows/release.yml that runs softprops/action-gh-release@v2 after the build succeeds, creating a GitHub Release automatically for each tag
• Auto-generated changelog via generate_release_notes: true — GitHub aggregates merged PRs and commits since the previous tag, grouped by label
• Scoped contents: write permission applied only to the release job; the rest of the workflow remains read-only
• release and docker jobs now run in parallel after call-build-workflow completes

release:
  name: Create GitHub Release
  needs:
    - call-build-workflow
  if: startsWith(github.ref, 'refs/tags/')
  runs-on: ubuntu-24.04
  permissions:
    contents: write
  steps:
    - name: Create Release
      uses: softprops/action-gh-release@v2
      with:
        generate_release_notes: true

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/softprops/action-gh-release/git/ref/tags/v2.2.2
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (http block)
• https://api.github.com/repos/softprops/action-gh-release/git/refs/tags/v2
  • Triggering command: /usr/bin/curl curl -s REDACTED (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)