[matrix] create a external DB matrix docker-compose for Task#11990

matrix_extDB/postgresql/.env

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+dbuser=synapse
+dbpassword=NEEDTOSETPASSWORD
+dbname=synapse

matrix_extDB/postgresql/README.md

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+## Usage and Components
+
+Note: as of 2023-09-12 this docker-compose is available internally.
+
+### Versions
+
+* Postresql: registry.ipv6.docker.com/library/postgres
+
+### Sample usage
+
+Setting up matrix for  ...
+
+```
+docker-compose up -d
+```

matrix_extDB/postgresql/docker-compose.yaml

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+version: '3'
+services:
+  postgres:
+    image: postgres:14
+    restart: unless-stopped
+    ports:
+      - "5432:5432/tcp"
+    volumes:
+     - ./postgresdata:/var/lib/postgresql/data
+    environment:
+     - POSTGRES_DB=${dbname}
+     - POSTGRES_USER=${dbuser}
+     - POSTGRES_PASSWORD=${dbpassword}
+     - POSTGRES_INITDB_ARGS=--encoding=UTF-8 --lc-collate=C --lc-ctype=C