chore(docker) : replace pgAdmin with Adminer for lighter DB management

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -45,34 +45,17 @@ services:
       - "${POSTGRES_PORT:-5433}:5432"
     restart: unless-stopped
 
-  pgadmin:
-    container_name: pgadmin-${DOCKER_APP_NAME}
-    image: dpage/pgadmin4:latest
-    user: root
+  adminer:
+    container_name: adminer-${DOCKER_APP_NAME}
+    image: adminer:latest
     environment:
-      PGADMIN_DEFAULT_EMAIL: ${PGADMIN_EMAIL:-admin@admin.com}
-      PGADMIN_DEFAULT_PASSWORD: ${PGADMIN_PASSWORD:-admin}
-      PGADMIN_CONFIG_SERVER_MODE: 'False'
-      PGADMIN_CONFIG_MASTER_PASSWORD_REQUIRED: 'False'
-      PGADMIN_SERVER_JSON_FILE: '/pgadmin4/servers.json'
-    volumes:
-      - pgadmin_data:/var/lib/pgadmin
-      - ./docker/pgadmin/servers.json:/pgadmin4/servers.json:ro
-      - ./docker/pgadmin/pgpass:/pgadmin4/pgpass:ro
+      ADMINER_DEFAULT_SERVER: db
+      ADMINER_DESIGN: dracula
     ports:
-      - "${PGADMIN_PORT:-5050}:80"
+      - "${ADMINER_PORT:-5050}:8080"
     depends_on:
       - db
     restart: unless-stopped
-    entrypoint: >
-      /bin/sh -c "
-      mkdir -p /var/lib/pgadmin &&
-      cp /pgadmin4/pgpass /var/lib/pgadmin/pgpass &&
-      chmod 600 /var/lib/pgadmin/pgpass &&
-      chown 5050:5050 /var/lib/pgadmin/pgpass &&
-      /entrypoint.sh
-      "
 
 volumes:
   pg_data:
-  pgadmin_data: