Heroku Map Refuses Script

I am using mapbox-gl-js on my app but I can not see i gives me a blank page in heroku and I get the error

Refused to load the script 'https://api.mapbox.com/mapbox-gl-js/plugins/mapbox-gl-supported/v2.0.0/mapbox-gl-supported.js' because it violates the following Content Security Policy directive: "script-src 'self'". Note that 'script-src-elem' was not explicitly set, so 'script-src' is used as a fallback.

I am trying different meta tags to solve this issue. What should I do to fix it?

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