public com.google.protobuf.ByteString getWorkingDirBytes() {
        java.lang.Object ref = workingDir_;
        if (ref instanceof String) {
          com.google.protobuf.ByteString b =
              com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
          workingDir_ = b;
          return b;
        } else {
          return (com.google.protobuf.ByteString) ref;
        }
      }
<pre>
Optional. If set, overrides the default DIR specified by the image.
</pre>

<code>string working_dir = 5 [(.google.api.field_behavior) = OPTIONAL];</code>

@return The bytes for workingDir.
java-workstations/proto-google-cloud-workstations-v1/src/main/java/com/google/cloud/workstations/v1/WorkstationConfig.java