ci: be explicit about branch and user

The last attempt failed at the push because the
branch was implied. Use an explicit branch,
and also use the renovate user for the commit.

.circleci/config.yml

@@ -197,16 +197,16 @@ jobs:
       - run:
           name: Configure git
           command: |
-            git config user.name "${CIRCLE_USERNAME}"
-            git config user.email "${CIRCLE_USERNAME}@users.noreply.github.com"
+            git config user.name "Renovate Bot"
+            git config user.email "bot@renovateapp.com"
             git remote set-url origin https://x-access-token:${GITHUB_TOKEN}@github.com/grpc-ecosystem/grpc-gateway.git
       - run:
           name: Git amend and push changes
           command: |
             git add .
             if output=$(git status --porcelain) && [ ! -z "$output" ]; then
               git commit --amend --no-edit
-              git push --force-with-lease
+              git push --force-with-lease origin ${CIRCLE_BRANCH}
             fi
 workflows:
   version: 2