Use dynamic github token

Signed-off-by: Tamal Saha <tamal@appscode.com>

Author: tamalsaha

.github/workflows/release-tracker.yml

@@ -21,8 +21,8 @@ jobs:
 
       - name: Prepare git
         env:
-          GITHUB_USER: 1gtm
-          GITHUB_TOKEN: ${{ secrets.LGTM_GITHUB_TOKEN }}
+          GITHUB_USER: ${{ github.actor }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
           git config --global user.name "${GITHUB_USER}"
           git config --global user.email "${GITHUB_USER}@appscode.com"
@@ -38,7 +38,7 @@ jobs:
           github.event.action == 'closed' &&
           github.event.pull_request.merged == true
         env:
-          GITHUB_USER: 1gtm
-          GITHUB_TOKEN: ${{ secrets.LGTM_GITHUB_TOKEN }}
+          GITHUB_USER: ${{ github.actor }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
           ./hack/scripts/update-release-tracker.sh