Refactor copyright check to use Makefile

Consolidate the copyright check step by replacing the standalone `check-copyright` command with `make check-copyright` in the GitHub Actions workflow. This change simplifies the workflow and aligns it with the existing Makefile-based approach.

Author: dspo

.github/workflows/golangci-lint.yml

@@ -27,12 +27,8 @@ jobs:
       - name: 🛩️ golangci-lint
         run: make lint
 
-  check-copyright:
-    name: Check Copyright
-    runs-on: ubuntu-latest
-    steps:
-      - name: ©️ check copyright
-        run: check-copyright
+      - name: ©️ check-copyright
+        run: make check-copyright
 
   crd-docs-check:
     name: Check CRD Docs