build: Add metadata to image

docs: Fix port availability in examples

Author: johnbcodes

Dockerfile

@@ -1,6 +1,9 @@
 FROM postgres:latest
 ARG MESSAGE_DB_VERSION
 
+LABEL org.opencontainers.image.description="Message DB on PostgreSQL"
+LABEL version="${MESSAGE_DB_VERSION}"
+
 WORKDIR /usr/src
 ADD https://github.com/message-db/message-db/archive/v${MESSAGE_DB_VERSION}.tar.gz message-db.tar.gz
 RUN tar -xzf message-db.tar.gz

README.md

@@ -35,8 +35,8 @@ services:
     image: ghcr.io/johnbcodes/message-db:1.2.6
     environment:
       POSTGRES_HOST_AUTH_METHOD: trust
-    expose:
-      - 5432
+    ports:
+      - 5432:5432
     volumes:
       - data-postgresql:/var/lib/postgresql/data
 

docker-compose.yml

@@ -8,4 +8,4 @@ services:
     environment:
       POSTGRES_HOST_AUTH_METHOD: trust
     ports:
-      - '5432'
+      - 5432:5432