Add support for synapse-http-antispam and integrate it with Draupnir

Supersedes https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/4284

roles/custom/matrix-synapse/tasks/ext/synapse-http-antispam/setup_install.yml

@@ -0,0 +1,37 @@
+# SPDX-FileCopyrightText: 2025 MDAD project contributors
+# SPDX-FileCopyrightText: 2025 Catalan Lover <catalanlover@protonmail.com>
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+---
+
+- name: Ensure git installed
+  ansible.builtin.package:
+    name: git
+    state: present
+
+- name: Clone synapse-http-antispam git repository
+  ansible.builtin.git:
+    repo: "{{ matrix_synapse_ext_synapse_http_antispam_git_repository_url }}"
+    version: "{{ matrix_synapse_ext_synapse_http_antispam_git_version }}"
+    dest: "{{ matrix_synapse_ext_path }}/synapse-http-antispam"
+  become: true
+  become_user: "{{ matrix_synapse_username }}"
+
+- ansible.builtin.set_fact:
+    matrix_synapse_modules: >
+      {{
+        matrix_synapse_modules | default([])
+        +
+        [{
+          "module": "synapse_http_antispam.HTTPAntispam",
+          "config": matrix_synapse_ext_synapse_http_antispam_config,
+        }]
+      }}
+
+    matrix_synapse_container_extra_arguments: >
+      {{
+        matrix_synapse_container_extra_arguments | default([])
+        +
+        ["--mount type=bind,src={{ matrix_synapse_ext_path }}/synapse-http-antispam/synapse_http_antispam.py,dst={{ matrix_synapse_in_container_python_packages_path }}/synapse_http_antispam.py,ro"]
+      }}