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/shared-secret-auth/setup_install.yml

@@ -1,3 +1,10 @@
+# SPDX-FileCopyrightText: 2019 - 2023 Slavi Pantaleev
+# SPDX-FileCopyrightText: 2019 Michael Haak
+# SPDX-FileCopyrightText: 2020 Chris van Dijk
+# SPDX-FileCopyrightText: 2022 Nikita Chernyi
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
 ---
 
 - name: Fail if Shared Secret Auth secret not set

roles/custom/matrix-synapse/tasks/ext/shared-secret-auth/setup_uninstall.yml

@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2019 - 2022 Slavi Pantaleev
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
 ---
 
 - name: Ensure matrix-synapse-shared-secret-auth doesn't exist