fix: Add Cmd Default/Input support to cleanup

Bring `post` actions step into consistency with `main` for changes
introduced in webfactory#154

Without this change, `sshAgentCmd` is undefined when passed to
`execFileSync()` during `cleanup` and `post` is never successful.

Author: tkalus

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+
+ * Add Cmd Default/Input support to cleanup (fixes #208)
+
 ## v0.9.0 [2024-02-06]
 
 ### Changed

cleanup.js

@@ -1,8 +1,10 @@
 const core = require('@actions/core');
 const { execFileSync } = require('child_process');
-const { sshAgentCmd } = require('./paths.js');
+const { sshAgentCmdDefault } = require('./paths.js');
 
 try {
+    const sshAgentCmdInput = core.getInput('ssh-agent-cmd');
+    const sshAgentCmd = sshAgentCmdInput ? sshAgentCmdInput : sshAgentCmdDefault;
     // Kill the started SSH agent
     console.log('Stopping SSH agent');
     execFileSync(sshAgentCmd, ['-k'], { stdio: 'inherit' });