[vasyl-ivanchuk]

Add multi chain support. The change is backwards compatible and supports single chain setup as before. Multi-chain setup looks like this:

- name: Run ZKsync OS (multi chain)
  uses: dutterbutter/zksync-server-action@v0.1.0
  with:
    version: latest
    protocol_version: v31.0
    setup: multi_chain
    # l2_ports defaults to:
    #   6565: 3050
    #   6566: 3051

also can be checked in this draft PR.

Example execution can be checked here.

Logs output:

Using anvil: /home/runner/work/_temp/a5b537e5-2013-4e2f-850c-79011d752c4f/anvil
anvil Version: 1.5.1-v1.5.1
Commit SHA: b0a9dd9ceda36f63e2326ce530c10e6916f4b8a2
Build Timestamp: 2025-12-19T14:07:55.455914129Z (1766153275)
Build Profile: maxperf
Starting anvil with --load-state /home/runner/work/zksync-js/zksync-js/.zks/local-chains/v31.0/l1-state.json
Run set -euo pipefail
Starting chain 506 with config: /home/runner/work/zksync-js/zksync-js/.zks/local-chains/v31.0/multi_chain/chain_506.yaml
Starting chain 6565 with config: /home/runner/work/zksync-js/zksync-js/.zks/local-chains/v31.0/multi_chain/chain_6565.yaml
Starting chain 6566 with config: /home/runner/work/zksync-js/zksync-js/.zks/local-chains/v31.0/multi_chain/chain_6566.yaml
Chain 506 launched (pid: 3246).
Chain 6565 launched (pid: 3761).
Chain 6566 launched (pid: 3892).

[dutterbutter]

@vasyl-ivanchuk please update the ci / self-test.

FYI: next week I intend to spend some time to move this repo to matter labs org.

[vasyl-ivanchuk]

@vasyl-ivanchuk please update the ci / self-test.

FYI: next week I intend to spend some time to move this repo to matter labs org.

@dutterbutter updated, please approve the workflow to see if it passes.