public Builder setWorkingDirectory(@Nullable AbsoluteUnixPath workingDirectory) {
      this.workingDirectory = workingDirectory;
      return this;
    }
Sets the working directory in the container. {@code null} signals to use the base image
value.

@param workingDirectory the working directory
@return this
jib-build-plan/src/main/java/com/google/cloud/tools/jib/api/buildplan/ContainerBuildPlan.java