Testnet: Kzgrs config

[bacv]

1. What does this PR implement

This PR introduces changes related to the cfgsync utility, specifically adding new functionality for configuration synchronization between nodes. It also includes adjustments to the Docker Compose configurations.

2. Does the code have enough context to be clearly understood?

The code includes documentation and contextual comments where necessary..

3. Who are the specification authors and who is accountable for this PR?

@bacv, Nomos Engineering

4. Is the specification accurate and complete?

N/A

5. Does the implementation introduce changes in the specification?

N/A

Checklist

• 1. Description added.
• 2. Context and links to Specification document(s) added.
• 3. Main contact(s) (developers and specification authors) added
• 4. Implementation and Specification are 100% in sync including changes. This is critical.
• 5. Link PR to a specific milestone.

[danielSanchezQ]

Is cfgsync a dispatcher of cfgs for the testnet nodes?

[bacv]

Is cfgsync a dispatcher of cfgs for the testnet nodes?

Yes, cfgsync replaces etcd and bash scripts for syncing the configurations for potentially arbitrary number of nodes in the network. In my opinion the key changes are reflected here:

nomos-node/compose.static.yml

Lines 5 to 13 in 24e81ab

	cfgsync:
	container_name: cfgsync
	build:
	context: .
	dockerfile: testnet/Dockerfile
	image: nomos:latest
	volumes:
	- ./testnet:/etc/nomos
	entrypoint: /etc/nomos/scripts/run_cfgsync.sh

nomos-node/testnet/scripts/run_nomos_node.sh

Lines 1 to 11 in 24e81ab

	#!/bin/sh
	set -e
	export CFG_FILE_PATH="/config.yaml" \
	CFG_SERVER_ADDR="http://cfgsync:4400" \
	CFG_HOST_IP=$(hostname -i) \
	RISC0_DEV_MODE=true
	/usr/bin/cfgsync-client && \
	exec /usr/bin/nomos-node /config.yaml --with-metrics --log-backend gelf --log-addr graylog:12201

• When a network is started, the cfgsync-server starts listening for a number of nodes to announce them selves;
• If correct number of nodes requested config, cfgsync responds to all with the configuration;
• Node is not started if cfgsync-client returns an error.

[danielSanchezQ]

This should be fine. Thanks!