Add and enforce license check (#327)

.github/workflows/license.yml

@@ -0,0 +1,23 @@
+name: License
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+    branches: ["main"]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Go ${{matrix.go-version}}
+        uses: actions/setup-go@v5
+        with:
+          go-version: ${{matrix.go-version}}
+
+      - name: Check
+        # NOTE: Keep in sync with .hooks/addlicense
+        run: go run github.com/google/[email protected] -check -s=only -ignore='bin/**' -ignore='**/.terraform.lock.hcl' -ignore='definitions/**' **

.hooks/addlicense

@@ -1,2 +1,3 @@
 #!/bin/sh
+# NOTE: Keep in sync with .github/workflow/license.yml
 go run github.com/google/[email protected] -s=only -ignore='bin/**' -ignore='**/.terraform.lock.hcl' -ignore='definitions/**' **