Add implementation for supporting SSL certificate

in postgres service.

docker/with-external-db/docker-compose-with-db.yml

@@ -48,12 +48,16 @@ services:
     user: postgres
     volumes:
       - ./pg-init-scripts:/docker-entrypoint-initdb.d
+      - ./ssl-certificates/root.crt:/var/lib/postgresql/root.crt
+      - ./ssl-certificates/server.crt:/var/lib/postgresql/server.crt
+      - ./ssl-certificates/server.key:/var/lib/postgresql/server.key
     ports:
       - 5432:5432
     # Edit the environment variables in postgres.env to change the database name, username, password, etc.
     # Postgres setup and configuration is outside the scope of this file.
     env_file:
       - postgres.env
+    command: "-c ssl=on -c ssl_ca_file=/var/lib/postgresql/root.crt -c ssl_cert_file=/var/lib/postgresql/server.crt -c ssl_key_file=/var/lib/postgresql/server.key"
     healthcheck:
       test: [ "CMD-SHELL", "pg_isready" ]
       interval: 10s