Use REUSE to enforce proper files license headers

.github/workflows/github-actions-tests.yml

@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2023 SUSE LLC
+#
+# SPDX-License-Identifier: Apache-2.0
+
 on: [push, pull_request]
 name: Test
 jobs:

.github/workflows/reuse.yml

@@ -0,0 +1,23 @@
+# SPDX-FileCopyrightText: 2022 Free Software Foundation Europe e.V. <https://fsfe.org>
+#
+# SPDX-License-Identifier: CC0-1.0
+
+name: REUSE Compliance Check
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    types:
+      - opened
+      - reopened
+      - synchronize
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - name: REUSE Compliance Check
+      uses: fsfe/reuse-action@v2

.gitignore

@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2023 SUSE LLC
+#
+# SPDX-License-Identifier: Apache-2.0
+
 .idea/
 rhn.conf
 inter-server-sync

.reuse/dep5

@@ -0,0 +1,34 @@
+Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Upstream-Name: inter-server-sync
+Upstream-Contact: Uyuni Project
+Source: https://github.com/uyuni-project/inter-server-sync
+
+# Sample paragraph, commented out:
+#
+# Files: src/*
+# Copyright: $YEAR $NAME <$CONTACT>
+# License: ...
+
+Files: go.mod
+Copyright: 2023 SUSE LLC
+License: Apache-2.0
+
+Files: go.sum
+Copyright: 2023 SUSE LLC
+License: Apache-2.0
+
+Files: inter-server-sync.changes* 
+Copyright: 2023 SUSE LLC
+License: Apache-2.0
+
+Files: inter-server-sync.spec
+Copyright: 2023 SUSE LLC
+License: Apache-2.0
+
+Files: .tito/tito.props
+Copyright: 2023 SUSE LLC
+License: Apache-2.0
+
+Files: .tito/packages/*
+Copyright: 2023 SUSE LLC
+License: Apache-2.0

LICENSES/Apache-2.0.txt

@@ -0,0 +1,73 @@
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LICENSES/CC0-1.0.txt

@@ -0,0 +1,121 @@
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