nginx-golang-postgres: add dev envs config

* 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/proxy/Dockerfile

@@ -1,2 +0,0 @@
-FROM nginx:1.13-alpine
-COPY conf /etc/nginx/conf.d/default.conf

nginx-golang-postgres/proxy/nginx.conf

@@ -2,7 +2,8 @@ server {
     listen       80;
     server_name  localhost;
     location / {
-        proxy_pass   http://backend:8000;
+        proxy_pass          http://backend:8000;
+        proxy_http_version  1.1;
     }
 
 }