Add license information to files in matrix-synapse/tasks/ext

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

roles/custom/matrix-synapse/tasks/ext/s3-storage-provider/setup_install.yml

@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2022 - 2025 Slavi Pantaleev
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
 ---
 
 # We install this into Synapse by making `matrix_synapse_ext_synapse_s3_storage_provider_enabled` influence other variables:

roles/custom/matrix-synapse/tasks/ext/s3-storage-provider/setup_uninstall.yml

@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2022 Slavi Pantaleev
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
 ---
 
 - name: Ensure matrix-synapse-s3-storage-provider-migrate.service and timer don't exist

roles/custom/matrix-synapse/tasks/ext/s3-storage-provider/validate_config.yml

@@ -1,3 +1,9 @@
+# SPDX-FileCopyrightText: 2022 Luke Moch
+# SPDX-FileCopyrightText: 2022 Slavi Pantaleev
+# SPDX-FileCopyrightText: 2023 MDAD project contributors
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
 ---
 - name: Fail if required s3-storage-provider settings not defined
   ansible.builtin.fail: