comp review todo app update (#146)

* new todo frontend

* yarn --> npm

* basic Dockerfile

* add Helm chart for todo list

* backend working

* connect new-app'd frontend to backend via proxy_pass

* move nginx conf

* move nginx conf back

* move helm chart to course repo

* add simple SSR node.js service

* log error message

* fix host typo

* fix dockerfiles

* add link to items page

* improve probe route for todo-backend

* canary probe route for todo-backend

* Dockerfile -> Containerfile todo-backend

* Dockerfile -> Containerfile todo-frontend

* remove commands for containerfile as part of comp review

todo-frontend/nginx.conf

@@ -2,8 +2,6 @@
 #   * Official English Documentation: http://nginx.org/en/docs/
 #   * Official Russian Documentation: http://nginx.org/ru/docs/
 
-env BACKEND_HOST;
-
 worker_processes auto;
 error_log stderr;
 pid /run/nginx.pid;
@@ -34,8 +32,6 @@ http {
     # for more information.
     include /etc/nginx/conf.d/*.conf;
 
-    perl_set $backend 'sub { return $ENV{"BACKEND_HOST"}; }';
-
     server {
         listen       8080 default_server;
         listen       [::]:8080 default_server;
@@ -45,21 +41,13 @@ http {
         # Load configuration files for the default server block.
         include /etc/nginx/default.d/*.conf;
 
-        sub_filter_types application/javascript;
-        sub_filter '_BACKEND_' $backend;
-        sub_filter_once off;
+        location /api/ {
+          proxy_pass http://todo-list:3000;
+        }
 
         location / {
         }
 
-#         error_page 404 /404.html;
-#             location = /40x.html {
-#         }
-
-#         error_page 500 502 503 504 /50x.html;
-#             location = /50x.html {
-#         }
-
     }
 
 }