* migrate test-infra to GitHub Actions
* change python base image to python:3.9-slim
* move from minikube to kind
* separate darts container images by device type
* run e2e test with multi kubernetes version
* disble to deploy katib-ui by default
* change kind kubernetes cluster version
* fix update-images.sh
* fix shellcheck
* fix script to setup katib
* split enas, darts and tf-mnist-with-summaries with trial images
* specicy experiments in pytorch-mnist-e2e-test
* reduce storage size for mysql
* fix trial image name for enas and darts
* fix trial image name for file-metrics-collector-with-json-format
* change kubernetes versions
* do not run e2e test on push master branch
* remove backoffLimit field in examples