Automate copyright headers addition (#2440)

* Refactor checking headers to automatically add them

.github/workflows/copyright-validate.yaml

@@ -1,10 +1,15 @@
-name: Check Copyright Headers
+name: Add Copyright Headers
 on: pull_request
 jobs:
   copywrite:
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
     steps:
       - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
       - uses: hashicorp/setup-copywrite@32638da2d4e81d56a0764aa1547882fc4d209636 # v1.1.3
-      - name: Check Header Compliance
-        run: copywrite headers --plan
+      - name: Add missing Copyright Headers
+        run: copywrite headers
+      - uses: stefanzweifel/git-auto-commit-action@8621497c8c39c72f3e2a999a26b4ca1b5058a842 # v5.0.1
+        with:
+          commit_message: Add missing copyright headers