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templates/blockchain/2/docker-compose.yml

 {{- $redisImage:="bitnami/redis:4.0"}}
 
-{{- $taskImage:=fmt.Sprintf("%s/task:alpine",.Values.docker_registry)}}
+{{- $taskImage:=printf("%s/task:alpine" .Values.docker_registry)}}
 {{$taskImage}}
 {{redisImage}}