[openstreetmap/openstreetmap-website] pngcrush not found (#1931)

[dog1993]

When I Create the databases using"bundle exec rake db:create",it reports some errors like

“pngcrush not found,please provide proper binary or disable this worker（）—no--pngcrush argument or‘：pngcrush →false’ through options ”.
“advpng not found,please provide proper binary or disable this worker（）—no--advpng argument or‘：advpng →false’ through options ”.

It seems that these errors are related to image.Does the file "openstreetmap-website" on  https://github.com/openstreetmap/openstreetmap-website.git     lack some useful  things?How can I fit it？

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