workflow action for copyright headers (#2345)

.github/workflows/copyright-validate.yaml

@@ -0,0 +1,10 @@
+name: Check Copyright Headers
+on: pull_request
+jobs:
+  copywrite:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
+      - uses: hashicorp/setup-copywrite@32638da2d4e81d56a0764aa1547882fc4d209636 # v1.1.3
+      - name: Check Header Compliance
+        run: copywrite headers --plan