webpack: handle _global img folder

Fixes missing image files after composer cleaning assets

Source of requireAll(): https://stackoverflow.com/a/30652110

Signed-off-by: Kevin Decherf <kevin@kdecherf.com>

app/Resources/static/themes/_global/share.js

@@ -1 +1,4 @@
 import './share.scss';
+
+function requireAll(r) { r.keys().forEach(r); }
+requireAll(require.context('./img/', true, /\.(jpg|png|gif|svg|ico)$/));

app/config/webpack/prod.js

@@ -76,7 +76,8 @@ module.exports = function () {
           }),
         },
         {
-          test: /\.(jpg|png|gif|svg)$/,
+          test: /\.(jpg|png|gif|svg|ico)$/,
+          include: /node_modules/,
           use: {
             loader: 'file-loader',
             options: {
@@ -84,6 +85,17 @@ module.exports = function () {
             },
           },
         },
+        {
+          test: /\.(jpg|png|gif|svg|ico)$/,
+          exclude: /node_modules/,
+          use: {
+            loader: 'file-loader',
+            options: {
+              context: 'app/Resources/static',
+              name: '[path][name].[ext]',
+            },
+          },
+        },
         {
           test: /\.(eot|ttf|woff|woff2)$/,
           use: {