refactor: use environment variables for Docker Compose credentials

Author: RinZ27

.pre-commit-config.yaml

@@ -3,16 +3,16 @@ services:
   postgres:
     image: postgres:13.9-alpine
     environment:
-      - POSTGRES_PASSWORD=password
+      - POSTGRES_PASSWORD=${POSTGRES_PASSWORD:-password}
     network_mode: "service:build_env"
   ftp:
     image: maven.earthdata.nasa.gov/cumuluss/vsftpd:3
     network_mode: "service:build_env"
     volumes:
       - ../packages/test-data:/srv:ro
     environment:
-      - FTP_USER=testuser
-      - FTP_PASSWORD=testpass
+      - FTP_USER=${FTP_USER:-testuser}
+      - FTP_PASSWORD=${FTP_PASSWORD:-testpass}
       - FTP_PASV_ADDRESS=127.0.0.1
   http:
     image: httpd:alpine