The documentation may do but many of the official images run as root and provide little to no documentation on how to change that, the Bitnami images in comparison are light years ahead.
A simple multistage example for Golang apps would be:
FROM golang:1.12.4
WORKDIR /opt/src/github.com/project1/myprog/
COPY . .
RUN go get -d -v ./...
RUN CGO_ENABLED=0 GOOS=linux go build -a -mod=vendor -o myprog .
FROM ubuntu:latest
RUN useradd -u 5002 user1
FROM scratch
COPY --from=0 /opt/src/github.com/project1/myprog/myprog .
COPY --from=1 /etc/passwd /etc/passwd
USER user1
ENTRYPOINT ["./myprog"]
