GitHub Action for RAT check

.github/workflows/rat.yaml

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+name: RAT Check
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - '**'
+
+jobs:
+  rat:
+    name: Apache RAT Check
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 17
+
+      - name: Download Apache RAT
+        run: |
+          curl -L -O https://downloads.apache.org/creadur/apache-rat-0.16.1/apache-rat-0.16.1-bin.tar.gz
+          tar -xzf apache-rat-0.16.1-bin.tar.gz
+
+      - name: Run RAT
+        run: |
+          java -jar apache-rat-0.16.1/apache-rat-0.16.1.jar -d . -E .rat-excludes > rat-report.txt
+          cat rat-report.txt
+          # Fail if unapproved licenses are found
+          grep -qe '^0 Unknown Licenses' rat-report.txt && exit 0 || exit 1

.rat-excludes

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+CHANGES.md
+go.sum
+rat-report.txt
+apache-rat-0.16.1
+snapcraft.yaml
+vendor
+.rat-excludes