Update cloud-setup.mdx

[ltfschoen]

Summary of changes

This is what worked for me.

I ended up actually using the following, but it didn't use Environment according to the logs.

Environment="/root/.config/webb-relayer/.env"
Type=exec
WorkingDirectory=/root/relayer
ExecStart="/root/.config/webb-relayer/run.sh"

And the contents of the executable run.sh file was

#!/bin/bash

source $HOME/.config/webb-relayer/.env
export PRIVATE_KEY=$PRIVATE_KEY && /root/relayer/target/release/webb-relayer -c /root/.config/webb-relayer/ -vvv

Proposed area of change

Put an x in the boxes that apply.

• Relayers

Code Checklist

• I have tested that prove my changes are working as intended
• I have added necessary documentation (if appropriate)

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