public Builder addExposedPort(Port exposedPort) {
      exposedPorts.add(exposedPort);
      return this;
    }
Adds a port to expose from the container.

@param exposedPort the port to expose
@return this
@see #setExposedPorts(Set)
jib-build-plan/src/main/java/com/google/cloud/tools/jib/api/buildplan/ContainerBuildPlan.java