Drop unused Prepare git step from release workflow

`make release` only does docker push (via docker/login-action) — no git
operations need the user.name / insteadOf rewrite the step was setting up.

Author: tamalsaha

.github/workflows/release.yml

@@ -54,18 +54,6 @@ jobs:
           pip install setuptools
           pip install linode-cli --upgrade
 
-      - name: Prepare git
-        env:
-          GITHUB_USER: ${{ github.actor }}
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: |
-          set -x
-          git config --global user.name "${GITHUB_USER}"
-          git config --global user.email "${GITHUB_USER}@appscode.com"
-          git config --global \
-            url."https://${GITHUB_USER}:${GITHUB_TOKEN}@github.com".insteadOf \
-            "https://github.com"
-
       - name: Install yq
         run: |
           curl -fsSL -o yqq https://github.com/mikefarah/yq/releases/download/3.3.0/yq_linux_amd64