Dockerfile

FROM golang:latest AS builder

ENV USER=appuser
ENV UID=10001

RUN adduser \
    --disabled-password \
    --gecos "" \
    --home "/nonexistent" \
    --shell "/sbin/nologin" \
    --no-create-home \
    --uid "${UID}" \
    "${USER}"

WORKDIR $GOPATH/github.com/andrewslotin/rummelsnuff

COPY go.mod go.sum ./
RUN go mod download

COPY *.go .

RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags='-w -s -extldflags "-static"' -a -o /tmp/rummelsnuff .

FROM scratch

COPY --from=builder /usr/share/zoneinfo /usr/share/zoneinfo
COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
COPY --from=builder /etc/passwd /etc/passwd
COPY --from=builder /etc/group /etc/group

COPY --from=builder /tmp/rummelsnuff /bin/rummelsnuff

USER appuser:appuser

ENTRYPOINT ["/bin/rummelsnuff"]