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/proxy/nginx.conf

@@ -0,0 +1,9 @@
+server {
+    listen       80;
+    server_name  localhost;
+    location / {
+        proxy_pass          http://backend:8000;
+        proxy_http_version  1.1;
+    }
+
+}