feat: add postgres 9.4 to match lowest usage of cruise director

Author: jweberst

docker/data-source-services/docker-compose.yml

@@ -34,6 +34,22 @@ services:
                 -c log_filename='%Y-%m-%d.log'
                 -c log_line_prefix='%t %v '
                 -c log_statement='all'"
+  postgres94:
+    image: postgres:9.4
+    container_name: sourcetoad_postgres94
+    ports:
+      - "5494:5432"
+    environment:
+      - POSTGRES_USER=postgres_user
+      - POSTGRES_PASSWORD=postgres_pass
+    networks:
+      - st-internal
+    command: "postgres
+                -c logging_collector='on'
+                -c log_directory='/var/log/postgresql'
+                -c log_filename='%Y-%m-%d.log'
+                -c log_line_prefix='%t %v '
+                -c log_statement='all'"
   mariadb104:
     image: mariadb:10.4
     container_name: sourcetoad_mariadb104