Add ALLOWED_OWNERS configuration for repository ownership validation

[Copilot]

Centralizes repository owner configuration to support kushmanmb-org and kushmanmb as valid owners.

Changes

• .github/scripts/allowed-owners.sh: Configuration script defining ALLOWED_OWNERS array and validate_owner() function
• .github/rulesets/APPLY_RULESETS.md: Updated ruleset application instructions to reference ALLOWED_OWNERS and use parameterized owner/repo variables instead of hardcoded kushmanmb-org/web

Usage

# Source in scripts for validation
source .github/scripts/allowed-owners.sh

REPO_OWNER="kushmanmb-org"  # or "kushmanmb"
if ! validate_owner "$REPO_OWNER"; then
  exit 1
fi

gh api /repos/${REPO_OWNER}/${REPO_NAME}/rulesets --input rulesets.json

The script can also be executed directly to list allowed owners:

$ .github/scripts/allowed-owners.sh
Allowed repository owners:
  - kushmanmb-org
  - kushmanmb

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