chore(TECHOPS-19100): switch to public worfklow tokens (#11)

* use public workflow token in release-please pipeline

Author: yemi-gbenebor

.github/workflows/release.yml

@@ -25,10 +25,9 @@ jobs:
       additional_unqualified_tags: true
       extra_tags: stable
     secrets:
-      RELEASE_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-    permissions:
-      contents: write
-      pull-requests: write
+      RELEASE_TOKEN: ${{ secrets.PUBLIC_RELEASES_TOKEN }}
+      RELEASE_ACTOR_GPG_PRIVATE_KEY: ${{ secrets.PUBLIC_RELEASES_GPG_PRIVATE_KEY }}
+      RELEASE_ACTOR_GPG_PASSPHRASE: ${{ secrets.PUBLIC_RELEASES_GPG_PASSPHRASE }}
 
   pypi-publish:
     name: Publish to PyPI