Playwright: Convert sliding-sync test to playwright (#11989)

* Add method to send text message

* Add dockerUrl to HomeServerConfig

* Implement sliding sync proxy

* Convert tests

* Reload page after applying labs feature

* Remove converted files

* Remove timeout

* Remove sliding-sync

* Remove proxy import

* Remove reference to proxy

* wait for load

* Update date

* Convert enableLabsFeature to separate fixture

* Enable feature in fixture

* Skip over config and just write to local-storage

* Rename fixture

* Fix room header test

* Use type inference

* Override config instead of setting localstorage

* Set default language

* Always add labs feature

* Put this one test into a separate describe block

* Move labs lag within describe block

playwright/plugins/homeserver/dendrite/index.ts

@@ -74,9 +74,11 @@ export class Dendrite extends Synapse implements Homeserver, HomeserverInstance
             "http://localhost:8008/_matrix/client/versions",
         ]);
 
+        const dockerUrl = `http://${await this.docker.getContainerIp()}:8008`;
         this.config = {
             ...denCfg,
             serverId: dendriteId,
+            dockerUrl,
         };
         return this;
     }
@@ -107,7 +109,10 @@ export class Pinecone extends Dendrite {
     protected entrypoint = "/usr/bin/dendrite-demo-pinecone";
 }
 
-async function cfgDirFromTemplate(dendriteImage: string, opts: StartHomeserverOpts): Promise<HomeserverConfig> {
+async function cfgDirFromTemplate(
+    dendriteImage: string,
+    opts: StartHomeserverOpts,
+): Promise<Omit<HomeserverConfig, "dockerUrl">> {
     const template = "default"; // XXX: for now we only have one template
     const templateDir = path.join(__dirname, "templates", template);