Implement admin API

[io7m]

Implement the shell and API that allows for actually creating assignments, repositories, and etc.

Users

• Assign roles to user
• Revoke roles from user
• Get roles for a user

Repositories

• Create/update repository
• Get repository
• Delete repository
• List repositories
• Create/update SCM provider
• List SCM providers
• Delete SCM provider
• Assign/unassign public key to/from repository
• List public keys assigned to repository

Public Keys

• Create/update public key
• Get key
• List key
• Delete public key

Agents

• Create/update agent
• Get agent
• List agents
• Delete agent
• Create/update label
• Get label
• List labels
• Delete label

Tool executions

• Delete tool execution
• Create/update tool execution
• Validate tool execution without saving
• Get tool execution
• List tool executions

Plans

• Delete plan
• Create/update plan
• Validate plan without saving
• Get plan
• List plans

Assignments

• Delete assignment
• Create/update assignment
• Get assignment
• List assignments

Assignment Executions

• Delete assignment execution (and logs)
• Get assignment execution (and work items)
• List assignment executions
• Get work item log

Need ways to answer the following questions:

• What is the server doing right now?
  • What assignments are executing right now?
    • Solution: Search for executions by state
  • What agents are currently connected to the system?
  • What users are currently connected to the system?
• What are the agents doing right now?
  • For each agent, what work items are being executed?
  • What's the most recent logging output for each agent's work item?
    • Solution: Use the agent work items API, and then fetch logs for each item.

[io7m]

Depends #7