fixed getContainerId() function

* since switching to podman builds in the CI, the getContainerId()
  function wasn't working anymore. As per default the hostname of the
  container is the same as the container id, we use the GetHostname()
  function to get the container id inside the container.

Author: bbernhard

src/client/client.go

@@ -288,16 +288,7 @@ func parseWhitespaceDelimitedKeyValueStringList(in string, keys []string) []map[
 }
 
 func getContainerId() (string, error) {
-	data, err := ioutil.ReadFile("/proc/1/cpuset")
-	if err != nil {
-		return "", err
-	}
-	lines := strings.Split(string(data), "\n")
-	if len(lines) == 0 {
-		return "", errors.New("Couldn't get docker container id (empty)")
-	}
-	containerId := strings.Replace(lines[0], "/docker/", "", -1)
-	return containerId, nil
+	return os.Hostname()
 }
 
 func ConvertGroupIdToInternalGroupId(id string) (string, error) {