Add REUSE validation

Author: ale5000-git

.github/workflows/reuse.yml

@@ -0,0 +1,19 @@
+---
+# SPDX-FileCopyrightText: none
+# SPDX-License-Identifier: CC0-1.0
+
+name: "REUSE"
+permissions: {}
+on: [push, pull_request, workflow_dispatch]
+
+jobs:
+  reuse:
+    name: "REUSE compliance check"
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+
+    steps:
+      - name: "Checkout sources"
+        uses: actions/checkout@v4
+      - name: "REUSE compliance check"
+        uses: fsfe/reuse-action@v5