weather/DockerfilePoller

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FROM --platform=$BUILDPLATFORM golang:1.16.0-alpine3.13 AS builder
# ex. amd64
ARG TARGETARCH
# ex. linux/amd64
ARG BUILDPLATFORM
RUN apk update && \
apk add --no-cache git ca-certificates make tzdata gcc libc-dev && \
apk add --no-cache -X http://dl-cdn.alpinelinux.org/alpine/edge/testing cfssl && \
update-ca-certificates
ENV USER=appuser
ENV UID=10001
ENV GID=10001
WORKDIR /data
RUN addgroup \
--gid "${GID}" \
"${USER}" && \
adduser \
--disabled-password \
--gecos "" \
--home "/nonexistent" \
--shell "/sbin/nologin" \
--no-create-home \
--uid "${UID}" \
-G "${USER}" \
"${USER}"
COPY Makefile .
COPY go.mod .
COPY go.sum .
RUN make dependencies
COPY . .
RUN make build-poller \
GOARCH=$TARGETARCH \
GOOS=$(echo $BUILDPLATFORM | cut -d'/' -f1) \
GOBUILDFLAGS="-a -tags netgo -installsuffix netgo" \
LDFLAGS="-w -s -d"
FROM scratch
USER appuser:appuser
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 --chown=appuser:appuser /data/bin/* /go/bin/poller
WORKDIR /go
ENTRYPOINT ["/go/bin/poller"]