add Dockerfile and nginx.conf

Dockerfile

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+FROM node:lts-alpine as build-step
+
+RUN mkdir -p /app
+
+WORKDIR /app
+
+COPY package.json /app
+
+RUN npm install
+
+COPY . /app
+
+RUN npm run build --prod
+
+FROM nginx:stable
+
+EXPOSE 80
+
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+COPY --from=build-step /app/dist/angular-tour-of-heroes /usr/share/nginx/html
+
+# ########### Openshift #################
+# # support running as arbitrary user which belogs to the root group
+# RUN chmod g+rwx /var/cache/nginx /var/run /var/log/nginx
+
+# # users are not allowed to listen on priviliged ports
+# RUN sed -i.bak 's/listen\(.*\)80;/listen 8081;/' /etc/nginx/conf.d/default.conf
+# EXPOSE 8081
+# # comment user directive as master process is run as user in OpenShift anyhow
+# RUN sed -i.bak 's/^user/#user/' /etc/nginx/nginx.conf
+# #######################################
+
+
+# When the container starts, replace the env.js with values from environment variables
+CMD ["/bin/sh",  "-c",  "envsubst < /usr/share/nginx/html/assets/env.template.js > /usr/share/nginx/html/assets/env.js && exec nginx -g 'daemon off;'"]

nginx.conf

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+server {
+    listen 80;
+    server_name localhost;
+
+    #access_log  /var/log/nginx/host.access.log  main;
+
+    location / {
+        root /usr/share/nginx/html;
+        index index.html index.htm;
+        try_files $uri $uri/ /index.html;
+    }
+
+    #error_page  404              /404.html;
+
+    # redirect server error pages to the static page /50x.html
+    #
+    error_page 500 502 503 504 /50x.html;
+    location = /50x.html {
+        root /usr/share/nginx/html;
+    }
+
+    # proxy the PHP scripts to Apache listening on 127.0.0.1:80
+    #
+    #location ~ \.php$ {
+    #    proxy_pass   http://127.0.0.1;
+    #}
+
+    # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
+    #
+    #location ~ \.php$ {
+    #    root           html;
+    #    fastcgi_pass   127.0.0.1:9000;
+    #    fastcgi_index  index.php;
+    #    fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
+    #    include        fastcgi_params;
+    #}
+    # deny access to .htaccess files, if Apache's document root
+    # concurs with nginx's one
+    #
+    #location ~ /\.ht {
+    #    deny  all;
+    #}
+}