Tweak Docker initialization (badges#3173)

* Tweak Docker initialization

1. Set NODE_ENV=production in Docker.
2. When NODE_ENV is production, bind to all interfaces. This seems like a
   sensible default.
3. Exclude Dockerfile from container to improve layer cacheability when
   modifying the dockerfile.

Ref badges#3165

* Rm obsolete comment

.dockerignore

@@ -3,3 +3,6 @@ shields.env
 .git/
 .gitignore
 .vscode/
+
+# Improve layer cacheability.
+Dockerfile

Dockerfile

@@ -6,20 +6,21 @@ RUN mkdir -p /usr/src/app
 RUN mkdir /usr/src/app/private
 WORKDIR /usr/src/app
 
-ARG NODE_ENV
-ENV NODE_ENV $NODE_ENV
-
 COPY package.json package-lock.json /usr/src/app/
 # Without the gh-badges package.json and CLI script in place, `npm ci` will fail.
 COPY gh-badges /usr/src/app/gh-badges/
-RUN npm ci
+
+# We need dev deps to build the front end.
+RUN NODE_ENV=development npm ci
 
 COPY . /usr/src/app
 RUN npm run build
 RUN npm prune --production
 RUN npm cache clean --force
 
-# Do we need to list the environment variables here?
+# Run the server using production configs.
+ENV NODE_ENV production
+
 CMD node server
 
 EXPOSE 80

config/production.yml

@@ -0,0 +1,3 @@
+public:
+  bind:
+    address: '0.0.0.0'