Is there a open to use license on the image

[pratikbagulgit]

I do not see an open to use license on the image - I am doing a POC with PYFLINK and found the image to be exactly sufficing my use case - hence checking if this image could be used and does this have an open source license ? Please could it be possible to add the license in the repo and the image on docker.

[dianfu]

@pratikbagulgit Have updated the repo to use Apache 2.0 License.