Parse Environment Variables in Agent Config Files

[stongo]

To make deploying nomad easier in containerland, parse environment variables in configuration files

[stongo]

it's been suggested I use consul-template instead. but this is not a viable replacement. for example, the configuration item advertise in nomad agent. In coreos I can pass the environment variable COREOS_PRIVATE_IPV4 as a docker run environment variable to easily set this rather than hardcoding it. using consul-template wouldn't solve this use case. instead I'll have to use sed on the config file in a docker container start script to accomplish this.

[diptanu]

@stongo We will revamp how we read configuration from HCL files. It's going to come up sometime in the future, but less of a priority right now since we have some higher priority stuff to take care of over the next few months.

[v-byte-cpu]

3.5 years passed and no progress ?

[tgross]

Shipped in Nomad 1.0 with HCL2.

[github-actions]

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