bundles/pretalx: support installing plugins

bundles/pretalx/items.py

@@ -161,3 +161,29 @@ files = {
         },
     },
 }
+
+# run `pip install` one after another due to concurrency issues
+last_action = 'action:pretalx_install'
+for plugin_name, plugin_config in node.metadata.get('pretalx/plugins', {}).items():
+    directories[f'/opt/pretalx/plugin_{plugin_name}'] = {}
+
+    git_deploy[f'/opt/pretalx/plugin_{plugin_name}'] = {
+        'repo': plugin_config['repo'],
+        'rev': plugin_config.get('rev', 'master'),
+        'triggers': {
+            f'action:pretalx_install_plugin_{plugin_name}',
+        },
+    }
+
+    actions[f'pretalx_install_plugin_{plugin_name}'] = {
+        'command': f'cd /opt/pretalx/plugin_{plugin_name} && /opt/pretalx/venv/bin/pip install --upgrade .',
+        'needs': {
+            last_action,
+        },
+        'triggers': {
+            'svc_systemd:pretalx-web:restart',
+            'svc_systemd:pretalx-worker:restart',
+        },
+        'triggered': True,
+    }
+    last_action = f'action:pretalx_install_plugin_{plugin_name}'