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exec format error Heroku dockerfile

# replace signingv2 with your own tag
docker buildx build --platform linux/amd64 -t signingv2 .

# make sure to use the name of your Heroku app
docker tag signingv2 registry.heroku.com/signingv2/web

# use docker push to push it to the Heroku registry
docker push registry.heroku.com/signingv2/web

# then use heroku release to activate
heroku container:release web -a signingv2