Change php-fpm to listen on :9000 to expose prometheus metrics via php-fpm_exporter

examples/docker-compose.postgres.yml

@@ -1,7 +1,7 @@
 version: '2'
 services:
   snappymail:
-    image: leojonathanoh/snappymail:merge
+    image: leojonathanoh/snappymail:pr-1
     ports:
       - 8888:8888
     volumes:
@@ -12,6 +12,16 @@ services:
       - redis-network
     restart: unless-stopped
 
+  # This provides prometheus metrics for snappymail's php-fpm
+  php-fpm-exporter:
+    image: hipages/php-fpm_exporter:2.2.0
+    ports:
+      - 9253:9253
+    environment:
+      - PHP_FPM_SCRAPE_URI=tcp://snappymail:9000/status
+    networks:
+      - default
+
   db:
     image: postgres:15-alpine
     environment: