Error: Error pinging Docker server: Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get "http://%2Fvar%2Frun%2Fdocker.sock/_ping": dial unix /var/run/docker.sock: connect: permission denied
  on main.tf line 21, in provider "docker":
    21: provider "docker" {

every time i try to build a docker container i get this error