Added way to have multiple runners and created shell runner

runners/shell.lua

@@ -0,0 +1,19 @@
+local core = require "core"
+
+---@class M
+local M = {
+  name = "shell"
+}
+
+function M:run(cmd, opts, name)
+  core.log("[jpdebug] Running shell command")
+  if cmd then
+    local proc = process.start(cmd, opts)
+    return proc
+  else
+    core.error("[jpdebug] command not specified for target %s", name)
+  end
+end
+
+return M
+