include crash detail in audit log transmission

closes #311

Author: Steve-Mcl

lib/launcher.js

@@ -603,7 +603,13 @@ class Launcher {
                 await this.logAuditEvent('stopped')
             } else {
                 this.state = States.CRASHED
-                await this.logAuditEvent('crashed')
+                // get last 20 lines of log
+                // NOTE: the log is added to the body in a specific property that should not actually
+                // be logged but rather extrated and examined to provide better reporting
+                // NOTE: 20 is typically enough to see the likes of Out Of Memory errors entries
+                const __launcherLog = this.getLog()?.toArray()?.slice(-20) || []
+                const body = { __launcherLog, info: { code, signal, info: 'Node-RED exited with non zero exit code' } }
+                await this.logAuditEvent('crashed', body)
 
                 // Only restart if our target state is not stopped
                 if (this.targetState !== States.STOPPED) {