chore: drop unused function

plugins/00_dokku-standard/subcommands/cleanup

@@ -2,7 +2,7 @@
 set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
 source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 
-dokku_cleanup_cmd(){
+dokku_cleanup_cmd() {
   declare desc="cleans up old deployment cruft"
   local cmd="cleanup"
 

plugins/common/functions

@@ -398,18 +398,6 @@ is_deployed() {
   fi
 }
 
-is_container_running() {
-  declare desc="return 0 if given docker container id is in running state"
-  local CID=$1
-  local CONTAINER_STATUS=$(docker inspect -f '{{.State.Running}}' "$CID" || true)
-
-  if [[ "$CONTAINER_STATUS" == "true" ]]; then
-    return 0
-  else
-    return 1
-  fi
-}
-
 is_container_status() {
   declare desc="return 0 if given docker container id is in given state"
   local CID=$1