chore: add GitHub action to build image for jx-docs

[LinuxSuRen]

Description

Visit this website is very slow from my country. It'd good to have a docker image. So I can deploy it. I'm considering deploy it to https://jx.jenkins-zh.cn.

In order to make sure it works. There're two GitHub secrets needed. They are the username and password (or token) of a GitHub account which can push the images to ghcr.io.

• GHCR_USER
• GHCR_TOKEN

Checklist:

• [x] I have mentioned the appropriate type(scope), as referenced here in the commit message and PR title for the semantic checks to pass.
• [x] I have signed off the commit, as per instructions mentioned here.
• [x] Any dependent changes have already been merged.

[sonarqubecloud[bot]]

SonarCloud Quality Gate failed.

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
3.2% Duplication

[jenkins-x-bot-test]

:star: PR built and available in a preview jenkins-x-jx-docs-pr-3212 here

[jenkins-x-bot-test]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[msvticket]

@LinuxSuRen Is this still something you are interested in?

[LinuxSuRen]

hi @msvticket It should work well. I tested it when I created this PR.

[msvticket]

What I meant was: Is this still a functionality you are interested in?

Are you still planning on deploying it to https://jx.jenkins-zh.cn?

[LinuxSuRen]

I see. I don't have that plan anymore. I guess we could close this now.