adds postgresql support

bitnami/express/docker-compose-postgresql.yml

@@ -0,0 +1,20 @@
+version: '2'
+
+services:
+  postgresql:
+    image: bitnami/postgresql:latest
+    environment:
+      - POSTGRESQL_DATABASE=my_app_development
+
+  myapp:
+    tty: true # Enables debugging capabilities when attached to this container.
+    image: bitnami/express:latest
+    environment:
+      - PORT=3000
+      - DATABASE_URL=postgres://postgres@postgresql/my_app_development
+    depends_on:
+      - postgresql
+    ports:
+      - 3000:3000
+    volumes:
+      - .:/app

bitnami/express/rootfs/app-entrypoint.sh

@@ -19,7 +19,7 @@ dependencies_up_to_date() {
 }
 
 database_tier_exists() {
-  [ -n "$(getent hosts mongodb mariadb)" ]
+  [ -n "$(getent hosts mongodb mariadb postgresql)" ]
 }
 
 __wait_for_db() {
@@ -50,6 +50,10 @@ wait_for_db() {
   if getent hosts mariadb >/dev/null; then
     __wait_for_db mariadb 3306
   fi
+
+  if getent hosts postgresql >/dev/null; then
+    __wait_for_db postgresql 5432
+  fi
 }
 
 add_database_support() {
@@ -60,6 +64,10 @@ add_database_support() {
   if getent hosts mariadb >/dev/null && ! npm ls mysql >/dev/null; then
     npm install --save mysql
   fi
+
+  if getent hosts postgresql >/dev/null && ! npm ls pg pg-hstore >/dev/null; then
+    npm install --save pg pg-hstore
+  fi
 }
 
 log () {