x509: certificate signed by unknown authority

I have built a Docker container with a Go application that used the Go AWS SDK. When my program tried to access an S3 bucket I got the error message

RequestError: send request failed
caused by: Get https://MY_BUCKET_NAME.s3.amazonaws.com: x509: certificate signed by unknown authority

To solve the problem I had to add the following line to the Dockerfile

On Ubuntu

RUN apt ca-certificates && rm -rf /var/cache/apk/*

On Alpine

RUN apk update && apk add ca-certificates && rm -rf /var/cache/apk/* 

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