Adding CODEOWNERS check Github Action workflow

Author: dbt-security-app[bot]

.github/workflows/codeowners-check.yml

@@ -0,0 +1,22 @@
+name: CODEOWNERS Coverage Check
+permissions:
+  contents: read
+
+on:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  validate-codeowners:
+    if: github.actor != 'dependabot[bot]'
+    runs-on: depot-ubuntu-24.04
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8  # actions/checkout@v6
+      - uses: mszostok/codeowners-validator@7f3f5e28c6d7b8dfae5731e54ce2272ca384592f #v0.7.4
+        env:
+          INPUT_GITHUB_APP_PRIVATE_KEY: "${{ secrets.SECENG_CICD_CHECKS_PRIVATE_KEY }}"
+          INPUT_GITHUB_APP_INSTALLATION_ID: "${{ secrets.SECENG_CICD_CHECKS_INSTALLATIONID }}"
+          INPUT_GITHUB_APP_ID: "${{ secrets.SECENG_CICD_CHECKS_APPID }}"
+        with:
+          checks: "owners,duppatterns"
+          experimental_checks: "notowned"