Note to self: SCSS and background images

I use background images in my .css.  When I deployed my app to Heroku, those images weren't showing up.

I used Google's developer tools and looked at the page's resources.  Those images are flagged as "not found".  Looking at the links, they were different-looking from my other precompuled assets.

Turned out that rather than url("image.png"), I needed url( image_path( "image.png")) in my .scss files.