Resource limits for ARC

[cboettig]

• ARC doesn't seem to handle resource limits when user specifies a container.

• not sure if we can disable container use though in ARC? needs testing (seems that mode must be either dind or kubernetes, the latter requires a container field in the action yaml, and also doesn't recognize command-line docker options like below.

Individual tasks can set action limits, probably the best way to go at this point.

e.g. for EFI config:

    runs-on: efi-cirrus
    container: 
      # IMPORTANT.  Please set a memory limit <= 45 GB.
      image: eco4cast/rocker-neon4cast:latest
      options: --memory="15g"
    steps:

(FIXME add links to GH ARC docs and issues here)