Make manifests public by default

[justmoon]

Codius manifests should be available for download by default. If a manifest contains proprietary code or is otherwise private, the user should set private: true in it.

{
  "manifest": {
    "image": "sharafian/crontract",
    "private": true
    "environment": {
      "DEBUG": "*",
      "COUNCIL_HOSTS": "10.200.10.1:8001",
      "ILP_PLUGIN": "ilp-plugin-payment-channel-framework",
      
    },
    "port": "5001"
  }
}