Setting up REUSE: add copyright statements to yml files in roles/custom/

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

roles/custom/matrix-bridge-mx-puppet-slack/tasks/main.yml

@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2024 MDAD Team and contributors
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
 ---
 
 - tags:

roles/custom/matrix-bridge-mx-puppet-slack/tasks/setup_install.yml

@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2024 MDAD Team and contributors
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
 ---
 
 - name: Ensure MX Puppet Slack paths exist

roles/custom/matrix-bridge-mx-puppet-slack/tasks/setup_uninstall.yml

@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2024 MDAD Team and contributors
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
 ---
 
 - name: Check existence of matrix-mx-puppet-slack service

roles/custom/matrix-bridge-mx-puppet-slack/tasks/validate_config.yml

@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2024 MDAD Team and contributors
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
 ---
 
 - name: Fail if required mx-puppet-slack settings not defined