Add renovate.json

templates/renovate.j2

@@ -1,4 +1,4 @@
 #!/bin/bash
 
 docker run --pull always --rm -v "/etc/renovate/config.js:/usr/src/app/config.js" -v "/var/run/docker.sock:/var/run/docker.sock" -v /tmp:/tmp -u "{{ renovate_docker_user_group }}" --env GITHUB_COM_TOKEN="{{ renovate_github_token }}" --env LOG_LEVEL={{ renovate_log_level }} {{ renovate_image_name }}:{{ renovate_image_tag }} renovate "$@"
-docker image prune -f
+docker image prune