Unable to create Repo Ruleset if RefName fields are empty

[dandehoon]

I encountered an issue while using the go-github library. When creating a GitHub Ruleset, I realized that two fields were inadvertently omitted from the request payload. As a result, the API call fails to create the ruleset.

Expected Behavior:
The github.Ruleset struct should include all the necessary fields to create a GitHub Ruleset, ensuring that no required fields are omitted, allow users to create ruleset successfully without encountering any errors.

Steps to Reproduce:
Both conditions.ref_name.include and conditions.ref_name.exclude fields are required even when empty.

curl -L -X POST "https://api.github.com/repos/ORG/REPO/rulesets" \
 -H "Accept: application/vnd.github+json" \
 -H "Authorization: Bearer $GITHUB_TOKEN" \
 -H "X-GitHub-Api-Version: 2022-11-28" \
 -H "content-type: application/json" \
 -d '{
 "name": "NAME",
 "target": "branch",
 "enforcement": "active",
 "bypass_mode": "none",
 "conditions": {
 "ref_name": {
 "include": ["refs/heads/main"]
 }
 },
 "rules": []
 }'

Cause response:

{
 "message": "Validation Failed",
 "errors": [
 "Invalid target patterns: ''"
 ],
 "documentation_url": "https://docs.github.com/rest/repos/rules#create-repository-ruleset"
}

Correct request

curl -L -X POST "https://api.github.com/repos/ORG/REPO/rulesets" \
 -H "Accept: application/vnd.github+json" \
 -H "Authorization: Bearer $GITHUB_TOKEN" \
 -H "X-GitHub-Api-Version: 2022-11-28" \
 -H "content-type: application/json" \
 -d '{
 "name": "NAME",
 "target": "branch",
 "enforcement": "active",
 "bypass_mode": "none",
 "conditions": {
 "ref_name": {
 "include": ["refs/heads/main"],
 "exclude": []
 }
 },
 "rules": []
 }'

Additional Information:

• go-github library version: v53.1.1-0.20230617123624-6a57598c53ef (master)

[gmlewis]

Ah, that is my fault. Sorry about that. Thanks for the PR!