updating flow for GH automated changelog creation (aws-games#262)

.github/workflows/changelog.yml

@@ -42,19 +42,16 @@ jobs:
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         FILE_TO_COMMIT: CHANGELOG.md
-        DESTINATION_BRANCH: changelog-${{ github.run_id }}
+        DESTINATION_BRANCH: changelog
       run: |
         export TODAY=$( date -u '+%Y-%m-%d' )
         export MESSAGE="chore: regenerate $FILE_TO_COMMIT for $TODAY"
         export SHA=$( git rev-parse $DESTINATION_BRANCH:$FILE_TO_COMMIT )
         export CONTENT=$( base64 -i $FILE_TO_COMMIT )
-        gh api --method POST /repos/:owner/:repo/git/refs \
-          --field ref="refs/heads/changelog-${{ github.run_id }}" \
-          --field sha="$SHA"
         gh api --method PUT /repos/:owner/:repo/contents/$FILE_TO_COMMIT \
           --field message="$MESSAGE" \
           --field content="$CONTENT" \
           --field encoding="base64" \
           --field branch="$DESTINATION_BRANCH" \
           --field sha="$SHA"
-        gh pr create --title "chore: update changelog" --body "This is an auto-generated PR to update the changelog." --base main --head changelog-${{ github.run_id }}
+        gh pr create --title "chore: update changelog" --body "This is an auto-generated PR to update the changelog." --base main --head $DESTINATION_BRANCH