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heroku plugins:install @heroku-cli/heroku-builds
$ heroku builds:cache:purge
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#First install the plugin:
heroku plugins:install heroku-builds
#Then use the following command to clear the cache:
heroku builds:cache:purge -a example-app
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//1.Install heroku-build plugin
heroku plugins:install heroku-builds
//2.Clear cache
heroku builds:cache:purge -a example-app