Add LockBranch and AllowForkSyncing to repos.go

[XaurDesu]

Fixes#2574 , and it is mostly a direct, if barebones, implementation of the plan ideated there. Adding references to LockBranch and AllowForkSyncing. References to RequireLastPushApproval were added in cb24cab . There might be some changes left to do.

[gmlewis]

After making the requested changes below, please run gofmt on repos.go and then also run go generate ./... at the top of the repo and push (not force-push) any changes that were made, as described in the file CONTRIBUTING.md.
Thanks.

[XaurDesu]

I can't seem to replicate the failing test in my local environment, already ran gofmt and go generate, but it seems to have no effect on tests, i think i might have a configuration problem on my end but i can't seem to figure it out.

[dtdao]

From checking the workflow file. The tests didnt run. Its failing at the

go-github/.github/workflows/tests.yml

Line 64 in 621c4ba

- name: Ensure go generate produces a zero diff

specifically at git diff --exit-code; portion of it.

edit:
I think i understand is missing and why you are failing the "tests"

@XaurDesu
So after adding the 2 fields to your struct.

1. gofmt github.com/repos.go
2. go generate -x ./...
   With the -x you should see 2 commands being log into your console.

 go run gen-accessors.go
go run gen-stringify-tests.go

3. Your git diff should be 3 files now.
4. Commit those and push and you should resolve the test errors.

[gmlewis]

Yes, you are correct, @dtdao - thank you for the detailed explanation.

This information should also be covered in our CONTRIBUTING.md guide at the top of this repo... if you feel that it can be made clearer, we welcome PRs for it as well.

[XaurDesu]

I agree that CONTRIBUTING.md could (and probably should) be clearer about some things, but as it should be evident by now, I'm pretty new to this kind of workflow, and i would rather solve a few more issues to get accustomed to the codebase before messing with any documentation we have, especially kind that regards new contributors. Maybe @dtdao could check that out.

[gmlewis]

Thank you, @XaurDesu !
LGTM.
Merging.

[codecov]

Codecov Report

Merging #2577 (bc17062) into master (621c4ba) will not change coverage.
The diff coverage is n/a.

@@ Coverage Diff @@## master #2577 +/- ##
=======================================
Coverage 97.98% 97.98% =======================================
Files 125 125 Lines 10875 10875 =======================================
Hits 10656 10656 Misses 150 150 Partials 69 69 

Impacted Files	Coverage Δ
github/repos.go	98.67% <ø> (ø)

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