allow agent to pull its metadata from environment #156
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In order to eventually support the no-sandbox mode, agents will need a way to get the NATS internal IP and port and the workloadId that it's been assigned from the node.
This PR makes it so that if the
NEX_SANDBOX
environment variable both exists and contains the value "false", then the agent will skip the MMDS query. When the agent is running in a sandbox (firecracker + rootfs), the agent is running as an openrc service and so won't have that env var.