ci: rename changelog updater token env to GH_TOKEN

was named BOT_TOKEN but now sourced from secrets.GITHUB_TOKEN -
misleading. rename the workflow env and the os.environ lookup in
the python updater so the name reflects what is actually injected.

Author: duzos

.github/workflows/append_changelog.yml

@@ -44,7 +44,7 @@ jobs:
       - name: Run changelog updater
         env:
           GITHUB_REPOSITORY: ${{ github.repository }}
-          BOT_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           GITHUB_EVENT_PATH: ${{ github.event_path }}
         run: |
           python scripts/update_changelog.py \

scripts/update_changelog.py

@@ -8,7 +8,7 @@
 args = parser.parse_args()
 
 repo = os.environ["GITHUB_REPOSITORY"]
-token = os.environ["BOT_TOKEN"]
+token = os.environ["GH_TOKEN"]
 headers = {"Authorization": f"Bearer {token}", "Accept": "application/vnd.github.v3+json"}
 
 # Fetch PR metadata