Add a workaround for setup-arcium not working on 0.6.2

Author: mikemaccana

.github/workflows/test.yml

@@ -13,17 +13,30 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
-      - name: Install libudev
-        run: sudo apt-get update && sudo apt-get install -y libudev-dev
-
+      # Use setup-arcium@v0.5.4 to install Rust, Solana, Anchor, and arcup
+      # Then override with Arcium 0.6.2 binary since arcup 0.6.2 has bootstrap bug
       - uses: arcium-hq/setup-arcium@v0.5.4
         with:
-          runner-arch-os: x86_64_linux
-          solana-cli-version: 2.3.11
-          arcium-version: 0.6.2
-          anchor-version: 0.32.1
+          runner-arch-os: "x86_64_linux"
+          arcium-version: "0.5.4"
+          solana-cli-version: "2.3.11"
+          anchor-version: "0.32.1"
+
+      # Override with Arcium 0.6.2 binary
+      # arcup 0.6.2 has bootstrap bug (panics with "index not found" at arcup/src/config.rs:29:51)
+      # so we download the 0.6.2 binary directly instead of using arcup
+      - name: Override with Arcium CLI 0.6.2
+        run: |
+          curl "https://bin.arcium.com/download/arcium_x86_64_linux_0.6.2" -o ~/.cargo/bin/arcium
+          chmod +x ~/.cargo/bin/arcium
+          arcium --version
 
-      - run: solana --version
+      # Verify Docker is running and can pull images
+      # Arcium requires Docker to run MPC nodes during tests
+      - name: Verify Docker
+        run: |
+          docker info
+          docker ps
 
       - run: npm i
 

tests/election.ts

@@ -1,5 +1,6 @@
 import { getSetComputeUnitLimitInstruction } from "@solana-program/compute-budget";
 import { randomBytes } from "crypto";
+import { promises as fs } from "fs";
 import { connect, type Connection } from "solana-kite";
 import {
   type KeyPairSigner,
@@ -24,7 +25,6 @@ import {
 } from "./arcium-solana-kit/helpers.js";
 import * as os from "os";
 import { describe, test, before } from "node:test";
-import assert from "node:assert";
 import {
   getRandomBigInt,
   makeClientSideKeys,
@@ -386,7 +386,7 @@ describe("Election", () => {
         compDefAccount: compDefPDA,
       });
 
-      const instructions = [];
+      const instructions: Array<Instruction> = [];
 
       if (needsComputeBudget) {
         // create_poll circuit requires higher compute budget due to initialization complexity