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!