Change gofer to output node-identity.json to /var/tmp

[ross-spencer]

Describe the issue

The file needs to persist or be recreated on reboot therefore it is better if it is in a more persistent location on the node's hard-drive.

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What component or features of Orcfax are affected?

• gofer

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Provide any further information

Good practice should be to create a default location /var/tmp/node-identity.json with the possibility of over-riding this as required.

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[ross-spencer]

NB. while it exists in /tmp folks might want to check its existence before the node runs. If it doesn't exist, it is recreated. TODO: add to docs.

[ross-spencer]

Via the helpful A4EVR pool. https://github.com/A4EVR/A4EVR-Pool/blob/fcd44611cc269b98d9291ef4675be73ba84df75d/orcfax/node-suite/orcfax_node_suite.sh

# Check if .node-identity.json exists in /tmp
if [ ! -f /tmp/.node-identity.json ]; then
    echo "Creating .node-identity.json..."
    # Run gofer to generate the .node-identity.json if it doesn't exist
    /orcfax/$NODE_NAME/gofer/gofer data ADA/USD -o orcfax
else
    echo ".node-identity.json already exists."
fi