Use spawn to address buffer size limitation issue (#84)

Co-authored-by: Son Thanh Nguyen <thanhson92@gmail.com>

Author: ibolmo

eval/dist/index.js

@@ -1,6 +1,6 @@
 import path from "path";
 import * as core from "@actions/core";
-import { exec as execSync } from "child_process";
+import { spawn } from "child_process";
 
 import { Params } from "./main";
 import { ExperimentSummary } from "braintrust";
@@ -19,11 +19,12 @@ function snakeToCamelCase(str: string) {
 async function runCommand(command: string, onSummary: OnSummaryFn) {
   core.info(`> $ ${command}`);
   return new Promise((resolve, reject) => {
-    const process = execSync(command);
+    const process = spawn(command, { shell: true });
 
-    process.stdout?.on("data", (text: string) => {
+    process.stdout?.on("data", (data: Buffer) => {
       onSummary(
-        text
+        data
+          .toString()
           .split("\n")
           .map(line => line.trim())
           .filter(line => line.length > 0)
@@ -46,8 +47,8 @@ async function runCommand(command: string, onSummary: OnSummaryFn) {
       );
     });
 
-    process.stderr?.on("data", data => {
-      core.info(data); // Outputs the stderr of the command
+    process.stderr?.on("data", (data: Buffer) => {
+      core.info(data.toString()); // Outputs the stderr of the command
     });
 
     process.on("close", code => {