Add a layotto lab showing users how to "run applications on multiple cloud"

[seeflood]

What would you like to be added:
Currently our lab is simple. We can add more labs.

For example, we can add a layotto lab showing users how to "run applications on multiple cloud".

This lab will be based on the "Bookinfo" project. After the bookinfo project is merged, we can add a lab for it

It's a subtask of #471

Reference:
lab: killercoda.com/mosn-tutorial/course/layotto
source code of the lab: mosn/mosn-tutorial

Why is this needed:

[seeflood]

@LXPWing Hi, can I assign it to you?
After the bookinfo project is merged, we can add a lab for it

[seeflood]

@LXPWing Next we should solve this issue.
As said in the #471 (comment) , it includes:

• deploy the preview service on alibaba cloud and aws, with a public IP @seeflood
• build a docker image for the bookinfo project @LXPWing
• build a lab to show features @LXPWing
  

[LXPWing]

@seeflood Java preview server needs an image in docker hub

[seeflood]

@LXPWing OK.
Then we need:

• 1. A dockerfile
• 2. Build and push docker image in the CI pipeline, like what we did in the layotto repo

Could u submit a PR for it?
If step 2 is too complex, we can only implement step 1 and push to dockerhub manually

[LXPWing]

@seeflood Where is my dockerfile push?

[seeflood]

@LXPWing We can tag it as layotto/examples-preview-service and push it to dockerhub.

As for the username/password to login to the dockerhub, you can configurate the github workflow to use the repo secret. An example is

layotto/.github/workflows/layotto-ci.yml

Line 266 in c9e000d

with:

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