nginx-golang-postgres: add dev envs config (#275)

* Add Docker Desktop Development Environments config
* Upgrade to Go 1.18
* Replace nginx build with image + read-only bind mount

Signed-off-by: Milas Bowman <milas.bowman@docker.com>

nginx-golang-postgres/compose.yaml

@@ -1,13 +1,18 @@
 services:
   backend:
-    build: backend
+    build:
+      context: backend
+      target: builder
     secrets:
       - db-password
     depends_on:
-      - db
+      db:
+        condition: service_healthy
+
   db:
     image: postgres
     restart: always
+    user: postgres
     secrets:
       - db-password
     volumes:
@@ -17,15 +22,27 @@ services:
       - POSTGRES_PASSWORD_FILE=/run/secrets/db-password
     expose:
       - 5432
-    
+    healthcheck:
+      test: [ "CMD", "pg_isready" ]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
   proxy:
-    build: proxy
+    image: nginx
+    volumes:
+      - type: bind
+        source: ./proxy/nginx.conf
+        target: /etc/nginx/conf.d/default.conf
+        read_only: true
     ports:
       - 80:80
     depends_on: 
       - backend
+
 volumes:
   db-data:
+
 secrets:
   db-password:
     file: db/password.txt