Adding a gh-action for generated java job

[yue9944882]

@brendandburns this automated workflow can help us to do the code generation via manually running workflow, in the end,a PR will be opened. see an example at https://github.com/yue9944882/java/pull/23/files

[brendandburns]

I don't think we need a token do we? This should be fully public.

[yue9944882]

the default token doesnt allow any cross-repo read/write even tho the repo is public. so we have to use a PAT token here, i granted the token merely read access

[brendandburns]

Generally looks good. One small comment.

We should consider creating a shared robot account so that we don't have to use our own personal access tokens.

[brendandburns]

Also, fwiw, this won't regenerate the fluent APIs so this is only going to work for patch updates (for now).

[yue9944882]

We should consider creating a shared robot account so that we don't have to use our own personal access tokens.

yeah the configured PAT token in this repo is current from my account, but the good news is that the permission is limitted (read only). ideally we should replace my personal token w/ a robot token.

Also, fwiw, this won't regenerate the fluent APIs so this is only going to work for patch updates (for now).

@brendandburns nice catch, now i added fluent generation to the job.

[yue9944882]

@brendandburns also we need to pick this to release-15 branch after it's merged

[brendandburns]

/lgtm
/approve

Thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: brendandburns, yue9944882

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [brendandburns,yue9944882]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment