Kesava

Update docker file to set gomodule flag to on

1

Without this we get below error `package github.com/hashicorp/hcl/hcl/printer: cannot find package "github.com/hashicorp/hcl/hcl/printer" in any of: /usr/local/go/src/github.com/hashicorp/hcl/hcl/printer (from $GOROOT) /go/src/github.com/hashicorp/hcl/hcl/printer (from $GOPATH)`