adjusted compose files name

pgadmin/compose.yaml

@@ -0,0 +1,17 @@
+services:
+  pgadmin:
+    image: dpage/pgadmin4
+    container_name: pgadmin4_container
+    restart: always
+    ports:
+      - "8888:80"
+    environment:
+      PGADMIN_DEFAULT_EMAIL: ${USERNAME}
+      PGADMIN_DEFAULT_PASSWORD: ${PASSWORD}
+    volumes:
+      - pgadmin-data:/var/lib/pgadmin
+    extra_hosts:
+      - "host.docker.internal:host-gateway" 
+
+volumes:
+  pgadmin-data: