Fixes #16074 - Adds BIND variable to startup process

Instead of binding to 0.0.0.0 we default to localhost
and use ENV variable BIND to override.
This also introduces '.env' files which helps to set
other ENV variables

.eslintignore

@@ -1,3 +1,4 @@
 # node_modules is ignored by default
 app/**
 vendor/**
+config/webpack.config.js

.gitignore

@@ -43,3 +43,4 @@ config/hooks
 .envrc
 node_modules
 public/webpack
+.env*

Procfile

@@ -1,5 +1,5 @@
 # Run Rails & Webpack concurrently
 # If you wish to use a different server then the default, use e.g. `export RAILS_STARTUP='puma -w 3 -p 3000 --preload'`
-rails: [ -n "$RAILS_STARTUP" ] && $RAILS_STARTUP || bin/rails server -b 0.0.0.0
+rails: [ -n "$RAILS_STARTUP" ] && $RAILS_STARTUP || [ -n "$BIND" ] && bin/rails server -b $BIND || bin/rails server
 # you can use WEBPACK_OPTS to customize webpack server, e.g. 'WEBPACK_OPTS='--https --key /path/to/key --cert /path/to/cert.pem --cacert /path/to/cacert.pem' foreman start '
 webpack: ./node_modules/.bin/webpack-dev-server --config config/webpack.config.js $WEBPACK_OPTS

config/webpack.config.js

@@ -12,6 +12,7 @@ var devServerPort = 3808;
 
 // set TARGETNODE_ENV=production on the environment to add asset fingerprints
 var production = process.env.RAILS_ENV === 'production' || process.env.NODE_ENV === 'production';
+var bindOn = process.env.BIND || '127.0.0.1';
 
 var config = {
   entry: {
@@ -91,7 +92,7 @@ if (production) {
   );
 } else {
   config.devServer = {
-    host: '0.0.0.0',
+    host: bindOn,
     port: devServerPort,
     headers: { 'Access-Control-Allow-Origin': '*' }
   };