Fix secrets redacting

Author: ehmicky

packages/@netlify-build/src/utils/patch-logs.js

@@ -12,11 +12,6 @@ function monkeyPatchLogs(secrets) {
       }
       let prefixSet = false
       const redactedArgs = args.map(a => {
-        // If log is logging error, redact and return stack
-        if (a instanceof Error) {
-          return redactValues(a.stack, secrets)
-        }
-
         const redactedLog = redactValues(a, secrets)
         if (typeof a === 'object') {
           return util.inspect(redactedLog, {

packages/@netlify-build/src/utils/redact.js

@@ -12,6 +12,10 @@ function redactValues(target, secrets) {
     return redactEnv.redact(target, secrets)
   }
 
+  if (target instanceof Error) {
+    return redactEnv.redact(target.stack, secrets)
+  }
+
   return mapObj(
     target,
     (key, value) => [