ci(github-actions): authenticate to registry.gitlab.com as @RecapTimeBot instead of its Service Account version

This should fix the auth error issues.

Author: ajhalili2006

.github/workflows/docker-build.yml

@@ -29,8 +29,8 @@ jobs:
         uses: docker/login-action@v2
         with:
           registry: registry.gitlab.com
-          username: ${{ secrets.RTDEVBOT_GITLAB_SERVICE_ACCOUNT }}
-          password: ${{ secrets.RTDEVBOT_GITLAB_REGISTRY_TOKEN }}
+          username: ${{ secrets.RTDEVBOT_GITLAB_USERNAME }}
+          password: ${{ secrets.RTDEVBOT_GITLAB_TOKEN }}
 
       - name: Generate metadata for Docker images
         id: meta