Add Rust validation server Docker entrypoint script and image target

[bragaigor]

• Add scripts/rust-val-entry.sh entrypoint that launches a single Rust validation server alongside the nitro node, replacing the two Go nitro-val processes used by split-val-entry.sh
• Add nitro-node-rust-validator Docker target for standalone use
• Add the Rust validator binary, rust-val-entry.sh, and curl to nitro-node-dev for testnode compatibility
• Build the Rust validation server (make build-validation-server) in the prover-builder Docker stage

Key differences from split-val-entry.sh

• Single Rust validator process instead of two Go nitro-val processes
• No legacy machines path needed — MachineLocator auto-discovers all module roots under --root-path
• Uses http:// URL (axum HTTP JSON-RPC) instead of ws:// (Go rpcclient supports both)
• Health check via curl (matching CI pattern) instead of netcat

How was it tested?

Tested locally using nitro-testnode:

1. Built the testnode with local nitro source:

cd nitro-testnode   
./test-node.bash --init-force --dev nitro --validate

2. Modified nitro-testnode/docker-compose.yaml to use rust-val-entry.sh for the validator service:

validator:  
  entrypoint: /usr/local/bin/rust-val-entry.sh  
 # removed validation_node from depends_on

3. Restarted the validator service and verified via docker compose logs -f validator:

• Rust validation server starts and logs Listening on 0.0.0.0:4141
• Health check passes
• Nitro node launches and connects to the validator

4. Also verified standalone image build and run:

docker build . --tag nitro-node-rust-validator --target nitro-node-rust-validator  
docker run --rm --entrypoint /usr/local/bin/rust-val-entry.sh nitro-node-rust-validator

closes NIT-4662

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 34.12%. Comparing base (fd2a5b0) to head (68952d9).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4571      +/-   ##
==========================================
- Coverage   34.35%   34.12%   -0.23%     
==========================================
  Files         498      498              
  Lines       58977    58977              
==========================================
- Hits        20262    20128     -134     
- Misses      35137    35274     +137     
+ Partials     3578     3575       -3     

[github-actions]

❌ 16 Tests Failed:

Tests completed	Failed	Passed	Skipped
4626	16	4610	0

View the top 3 failed tests by shortest run time

TestAliasingFlaky

Stack Traces | -0.000s run time

... [CONTENT TRUNCATED: Keeping last 20 lines]
INFO [03-27|16:51:59.087] Updated payload                          id=0x03966cc62e919714                      number=44 hash=dc221c..0ae37b txs=1  withdrawals=0 gas=21000     fees=0.002089421463 root=aea772..2cbc36 elapsed="294.451µs"
INFO [03-27|16:51:59.088] Stopping work on payload                 id=0x03966cc62e919714                      reason=delivery
INFO [03-27|16:51:59.088] Imported new potential chain segment     number=44 hash=dc221c..0ae37b blocks=1  txs=1  mgas=0.021 elapsed="444.904µs" mgasps=47.201   triediffs=214.99KiB triedirty=0.00B
INFO [03-27|16:51:59.088] Chain head was updated                   number=44 hash=dc221c..0ae37b root=aea772..2cbc36 elapsed="40.552µs"
INFO [03-27|16:51:59.089] Starting work on payload                 id=0x0351db2c21bcf9b8
INFO [03-27|16:51:59.089] Updated payload                          id=0x0351db2c21bcf9b8                      number=45 hash=77fd93..a0eb95 txs=0  withdrawals=0 gas=0         fees=0              root=149098..5090dd elapsed="246.624µs"
INFO [03-27|16:51:59.089] Stopping work on payload                 id=0x0351db2c21bcf9b8                      reason=delivery
INFO [03-27|16:51:59.089] Ethereum protocol stopped
INFO [03-27|16:51:59.089] Imported new potential chain segment     number=45 hash=77fd93..a0eb95 blocks=1  txs=0  mgas=0.000 elapsed="339.014µs" mgasps=0.000    triediffs=218.29KiB triedirty=0.00B
INFO [03-27|16:51:59.089] Transaction pool stopped
INFO [03-27|16:51:59.089] Chain head was updated                   number=45 hash=77fd93..a0eb95 root=149098..5090dd elapsed="25.128µs"
INFO [03-27|16:51:59.089] Persisting dirty state                   head=34 root=70fda7..3756ce layers=34
INFO [03-27|16:51:59.090] Submitted transaction                    hash=0x57e601445b3627d121f392223c7ddaf5b9f69d47135ad2f827a6de00c52de5fa from=0xaF24Ca6c2831f4d4F629418b50C227DF0885613A nonce=5  recipient=0xaF24Ca6c2831f4d4F629418b50C227DF0885613A value=1,000,000,000,000
INFO [03-27|16:51:59.090] Starting work on payload                 id=0x03c9d2f306da1642
INFO [03-27|16:51:59.090] Persisted dirty state to disk            size=167.01KiB elapsed="958.109µs"
INFO [03-27|16:51:59.091] Blockchain stopped
INFO [03-27|16:51:59.091] Updated payload                          id=0x03c9d2f306da1642                      number=46 hash=f3a2fa..e6d04a txs=1  withdrawals=0 gas=21000     fees=0.002091897704 root=aba433..cfc706 elapsed="403.52µs"
INFO [03-27|16:51:59.091] Stopping work on payload                 id=0x03c9d2f306da1642                      reason=delivery
INFO [03-27|16:51:59.091] Imported new potential chain segment     number=46 hash=f3a2fa..e6d04a blocks=1  txs=1  mgas=0.021 elapsed="447.023µs" mgasps=46.977   triediffs=222.23KiB triedirty=0.00B
INFO [03-27|16:51:59.091] Chain head was updated                   number=46 hash=f3a2fa..e6d04a root=aba433..cfc706 elapsed="24.096µs"

TestPruningDBSizeReduction

Stack Traces | 0.000s run time

=== RUN   TestPruningDBSizeReduction
--- FAIL: TestPruningDBSizeReduction (0.00s)

TestPruningDBSizeReduction

Stack Traces | 0.000s run time

=== RUN   TestPruningDBSizeReduction
--- FAIL: TestPruningDBSizeReduction (0.00s)

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