Added vkrunner image in dev + default value for nbjobs when nil

config/dev.exs

@@ -36,7 +36,8 @@ config :zcash_explorer, Zcashex,
   zcashd_username: "zcashrpc",
   zcashd_password: "changeme",
   vk_cpus: "0.2",
-  vk_mem: "2048M"
+  vk_mem: "2048M",
+  vk_runnner_image: "nighthawkapps/vkrunner"
 
 # ## SSL Support
 #

lib/zcash_explorer_web/controllers/page_controller.ex

@@ -102,7 +102,7 @@ defmodule ZcashExplorerWeb.PageController do
     with true <- String.starts_with?(vkey, "zxview"),
          true <- is_integer(String.to_integer(height)),
          true <- String.to_integer(height) >= 0,
-         true <- Cachex.get!(:app_cache, "nbjobs") <= 10 do
+         true <- Cachex.get!(:app_cache, "nbjobs") || 1 <= 10  do
       cmd =
         MuonTrap.cmd("docker", [
           "create",