[synapse] Add sliding sync v3 proxy

synapse/docker-compose.yaml

@@ -29,9 +29,36 @@ services:
     networks:
       - server
 
+  sliding-sync-proxy:
+    image: ghcr.io/matrix-org/sliding-sync:${sliding_sync_version:-latest}
+    restart: unless-stopped
+    environment:
+      - VIRTUAL_HOST=syncv3.matrix.jfreudenberger.de # the domain where the service should be reached
+      - VIRTUAL_PORT=8008 # the port the service listens in the container
+      - LETSENCRYPT_HOST=syncv3.matrix.jfreudenberger.de # the same domain as VIRTUAL_HOST; this enables ssl
+      - SYNCV3_SERVER=https://matrix.jfreudenberger.de
+      - SYNCV3_DB=postgresql://sliding:sliding@sliding-db:5432/sliding?sslmode=prefer
+      - SYNCV3_SECRET=${sliding_sync_secret}
+    networks:
+      - slidingnet
+      - webproxy
+
+  sliding-db:
+    image: postgres:${postgres_version:-13}
+    restart: unless-stopped
+    environment:
+      - POSTGRES_PASSWORD=sliding
+      - POSTGRES_USER=sliding
+      - POSTGRES_DB=sliding
+    volumes:
+      - sliding_postgres_data:/var/lib/postgresql/data
+    networks:
+      - slidingnet
+
 volumes:
   custom_modules:
   postgres_data:
+  sliding_postgres_data:
 
 networks:
   server:
@@ -40,3 +67,5 @@ networks:
     external: true
   synapsenet:
     name: synapsenet
+  slidingnet:
+    name: slidingnet