This pull request introduces support for external workspace management, allowing users to register and manage workspaces that are provisioned and managed outside of the Coder.
* coder external-workspaces create - Creates a new external workspace (this command extends coder create)
* Example: coder external-workspaces create ext-workspace --template=externally-managed-workspace -y
* Checks if template has coder_external_agent resource before creating a workspace
* coder external-workspaces list - Lists all external workspaces
* coder external-workspaces agent-instructions <workspace name> <agent name> - Retrieves agent connection instruction
* Example: coder external-workspaces agent-instructions ext-workspace main --output=json
Kacper Sawicki