Dockerfile2.prod

############################
# STEP 1 build executable binary
############################
FROM golang:alpine AS builder
# Install git.
# Git is required for fetching the dependencies.
RUN apk update && apk add --no-cache git
# Create appuser.
ENV USER=appuser
ENV UID=10001 
# See https://stackoverflow.com/a/55757473/12429735RUN 
RUN adduser \    
    --disabled-password \    
    --gecos "" \    
    --home "/nonexistent" \    
    --shell "/sbin/nologin" \    
    --no-create-home \    
    --uid "${UID}" \    
    "${USER}"
WORKDIR $GOPATH/src/
COPY app/ .
# Fetch dependencies.
# Using go get.
RUN go get -d -v
# Using go mod.
# RUN go mod download
# RUN go mod verify
# Build the binary.
RUN GOOS=linux GOARCH=amd64 go build -ldflags="-w -s" -o /go/bin/hello

FROM scratch
# Import the user and group files from the builder.
COPY --from=builder /etc/passwd /etc/passwd
COPY --from=builder /etc/group /etc/group
# Copy our static executable.
COPY --from=builder /go/bin/hello /go/bin/hello
# Use an unprivileged user.
USER appuser:appuser
# Run the hello binary.
ENTRYPOINT ["/go/bin/hello"]