Add GitHub Action "REUSE Compliance Check"

It is also possible to check compliance by running reuse as pre-commit hook, which does not depend on GitHub. See: https://reuse.readthedocs.io/en/stable/readme.html#run-as-pre-commit-hook

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

.github/workflows/reuse.yml

@@ -0,0 +1,20 @@
+# SPDX-FileCopyrightText: 2024 MDAD Team and contributors
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+---
+name: REUSE Compliance Check
+
+on:  # yamllint disable-line rule:truthy
+  push:
+  pull_request:
+
+jobs:
+  reuse-compliance-check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: REUSE Compliance Check
+        uses: fsfe/reuse-action@v5