utils: add new execute utility

This new function is similar to `run` except that it requires that the
arguments be passed properly quoted and pre-split through an array.  It
also will not permit the prefixing a command for execution.  The major
difference between `run` and `execute` is that `execute` will not go
through a shell, so parameter expansion, variable substitution, etc do
not occur.  Additionally, because there is no shell involved, a single
process is created rather than two processes (one for the shell, and the
actual process being invoked).  This is required to enable using this
action on Windows, where the process redirection does not work as the
shell used is different.

src/utils/action.js

@@ -1,8 +1,9 @@
-const { execSync } = require("child_process");
+const { execSync, spawnSync } = require("child_process");
 
 const core = require("@actions/core");
 
 const RUN_OPTIONS_DEFAULTS = { dir: null, ignoreErrors: false, prefix: "" };
+const EXECUTE_OPTIONS_DEFAULTS = { dir: null, ignoreErrors: false };
 
 /**
  * Returns the value for an environment variable. If the variable is required but doesn't have a
@@ -72,7 +73,44 @@ function run(cmd, options) {
 	}
 }
 
+/**
+ * Executes the provided binary with the given arguments.
+ * @param {string} command - binary to execute
+ * @param {{dir: string, ignoreErrors: boolean}} [options] - {@see EXECUTE_OPTIONS_DEFAULTS}
+ * @returns {{status: number, stdout: string, stderr: string}} - Output of the command
+ */
+function execute(command, args, options) {
+	const optionsWithDefaults = {
+		...EXECUTE_OPTIONS_DEFAULTS,
+		...options,
+	};
+
+	core.debug(`${command} ${args.filter(e => e).join(" ")}`);
+
+	const process = spawnSync(command, args.filter(e => e), {
+		cwd: optionsWithDefaults.dir,
+		encoding: "utf-8",
+		maxBuffer: 20 * 1024 * 1024,
+	});
+
+	const output = {
+		status: process.status,
+		stdout: process.stdout.trim(),
+		stderr: process.stderr.trim(),
+	};
+
+	core.debug(`Exit code: ${output.status}`);
+	core.debug(`Stdout: ${output.stdout}`);
+	core.debug(`Stderr: ${output.stderr}`);
+
+	if (!optionsWithDefaults.ignoreErrors && child.status != 0) {
+		throw child.error;
+	}
+	return output;
+}
+
 module.exports = {
+	execute,
 	getEnv,
 	run,
 };