adding configfiles

create_config.sh

@@ -0,0 +1,5 @@
+docker run -it --rm \
+    --mount type=volume,src=synapse-data,dst=/data \
+    -e SYNAPSE_SERVER_NAME=your.domain \
+    -e SYNAPSE_REPORT_STATS=yes \
+    matrixdotorg/synapse:latest generate

docker-compose.yml

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+version: '3'
+
+services:
+  synapse:
+    image: matrixdotorg/synapse:latest
+    restart: always
+    ports:
+      - "8008:8008"
+    volumes:
+      - ./synapse_data/:/data/
+    links:
+      - db
+  db:
+    image: postgres:alpine
+    expose:
+      - 5432
+    restart: always
+    volumes:
+     - ./postgres_data/:/var/lib/postgresql/data/
+     - ./init.sql:/docker-entrypoint-initdb.d/init.sql
+    environment:
+      POSTGRES_USER: matrix
+      POSTGRES_PASSWORD: your-secret-pw

init.sql

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+CREATE DATABASE synapse
+ ENCODING 'UTF8'
+ LC_COLLATE='C'
+ LC_CTYPE='C'
+ template=template0
+ OWNER matrix;
+GRANT ALL PRIVILEGES ON DATABASE synapse TO matrix;