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/Containerfile

@@ -0,0 +1,28 @@
+FROM registry.access.redhat.com/ubi8/nodejs-14 AS appbuild
+
+LABEL version="1.0"
+LABEL description="To Do List application builder"
+
+# ENV REACT_APP_API_HOST=http://localhost:3000
+ENV REACT_APP_API_HOST=""
+
+USER 0
+
+COPY . /tmp/todo-frontend
+
+RUN cd /tmp/todo-frontend
+RUN npm install
+RUN npm run build
+
+# https://github.com/sclorg/nginx-container
+FROM registry.access.redhat.com/ubi8/nginx-118
+
+LABEL version="1.0"
+LABEL description="To Do List application front-end"
+LABEL creationDate="2017-12-25"
+LABEL updatedDate="2021-05-19"
+
+COPY nginx.conf /etc/nginx/
+COPY --from=appbuild /tmp/todo-frontend/build /usr/share/nginx/html
+
+CMD nginx -g "daemon off;"