Adding Secrets + Public Key to Repository

[maddymanu]

Description

Hey everyone!! I added support for creating secrets for a given repository using the API.
The relevant docs are here: https://docs.github.com/en/rest/actions/secrets#create-or-update-a-repository-secret

It also needed the getPublicKey method, also added!
I've tested this with a local snapshot. and has worked in production as well.

I'd be happy to address any changes!!

Before submitting a PR:

• Changes must not break binary backwards compatibility. If you are unclear on how to make the change you think is needed while maintaining backward compatibility, CONTRIBUTING.md for details.
• Add JavaDocs and other comments as appropriate. Consider including links in comments to relevant documentation on https://docs.github.com/en/rest .
• Add tests that cover any added or changed code. This generally requires capturing snapshot test data. See CONTRIBUTING.md for details.
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• Push your changes to a branch other than main. You will create your PR from that branch.

When creating a PR:

• Fill in the "Description" above with clear summary of the changes. This includes:
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[maddymanu]

@bitwiseman any chance we could get this in?
I'd be happy to address any feedback or comments!!

[bitwiseman]

@maddymanu
Sorry for slow turn around time. Assuming all tests pass, I'll merge and publish later tonight.

[codecov]

Codecov Report

Merging #1446 (1fa164c) into main (38918c4) will increase coverage by 0.04%.
The diff coverage is 94.11%.

@@             Coverage Diff              @@
##               main    #1446      +/-   ##
============================================
+ Coverage     78.76%   78.80%   +0.04%     
- Complexity     2107     2113       +6     
============================================
  Files           201      202       +1     
  Lines          6410     6427      +17     
  Branches        361      361              
============================================
+ Hits           5049     5065      +16     
- Misses         1151     1152       +1     
  Partials        210      210              

Impacted Files	Coverage Δ
...java/org/kohsuke/github/GHRepositoryPublicKey.java	83.33% <83.33%> (ø)
src/main/java/org/kohsuke/github/GHRepository.java	68.93% <100.00%> (+0.53%)	⬆️

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[maddymanu]

No worries at all @bitwiseman !!! TY so much!!