[FEAT]: Make it easier to use github app installation tokens

[stiak]

Describe the need

I wanted to perform actions on github repo's as the application - not an individual user who might leave the organisation.

I was trying to use a client_id and client_secret for this, but not succeeding.

I ended up following the instructions here.

This works, but:

• It's not explained well in the Readme.
• Involved me copy+pasting the private key => JWT generation code.

Ideally the client signature would instead be something like:

Octokit::Client.new(app_id: <my 20 character app id>, private_key: <key contents>, installation_id: <ID>)

The SDK would handle the juggling that happens behind the scenes. This seems similar to how the JS client works.

SDK Version

No response

API Version

No response

Relevant log output

No response

Code of Conduct

• I agree to follow this project's Code of Conduct

[github-actions]

👋 Hi! Thank you for this contribution! Just to let you know, our GitHub SDK team does a round of issue and PR reviews twice a week, every Monday and Friday! We have a process in place for prioritizing and responding to your input. Because you are a part of this community please feel free to comment, add to, or pick up any issues/PRs that are labeled with Status: Up for grabs. You & others like you are the reason all of this works! So thank you & happy coding! 🚀

[pbstriker38]

Would you also expect it to refresh the access token for you when it expires since you will no longer be in control of that flow?

[stiak]

That'd be ideal - that also seems to be how the JS SDK works:

Additionally, the SDK will take care of regenerating an installation access token for you so you don't need to worry about the one hour expiration.