fix(ci): add environment declaration for release-please secret access (#27)

* Initial plan

* fix(ci): restore github.token fallback for release-please

When secrets.RELEASE_PLEASE_TOKEN is not configured, fall back to
github.token so the release-please job doesn't fail with
"Input required and not supplied: token".

Co-authored-by: deviantintegral <255023+deviantintegral@users.noreply.github.com>

* fix(ci): add environment: main to release-please job for env secret access

The RELEASE_PLEASE_TOKEN is an environment secret under the 'main'
environment. The job needs to declare this environment to access it.
Remove the github.token fallback since the secret is configured.

Co-authored-by: deviantintegral <255023+deviantintegral@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: deviantintegral <255023+deviantintegral@users.noreply.github.com>

Author: Copilot

.github/workflows/release.yml

@@ -14,6 +14,7 @@ jobs:
 
   release-please:
     runs-on: ubuntu-24.04
+    environment: main
     outputs:
       release_created: ${{ steps.release.outputs.release_created }}
     steps: