Try out Argo and Flux

[hongchaodeng]

Here are some learning materials:

• https://argoproj.github.io/argo-cd/
• https://docs.fluxcd.io/en/latest/tutorials/get-started/

[hongchaodeng]

Next steps:

• Have an e2e pipeline for both Argo and Flux to deploy applications to OAM+k8s. @anubhavsingh16
• Have some stories how to use CUE+Kustomize to manage configuration files. @hongchaodeng