Chcek REUSE compliance in CI

Author: mnishiguchi

.github/workflows/ci.yml

@@ -148,3 +148,13 @@ jobs:
 
       - name: Run test
         run: mix test --warnings-as-errors --trace --slowest 10
+
+  reuse:
+    name: Check REUSE Compliance
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Run REUSE lint
+        uses: fsfe/reuse-action@v1