Add env setting to image resizer, part 1.

Thanks to xet7 !

server/max-image-pixel.js

@@ -0,0 +1,7 @@
+Meteor.startup(() => {
+  if (process.env.MAX_IMAGE_PIXEL) {
+    Meteor.settings.public.MAX_IMAGE_PIXEL = process.env.MAX_IMAGE_PIXEL;
+    Meteor.settings.public.IMAGE_COMPRESS_RATIO =
+      process.env.IMAGE_COMPRESS_RATIO;
+  }
+});