tag-checker/Dockerfile.multi-stage

ARG REPO=library
FROM golang:1.15-alpine AS builder

# hadolint ignore=DL3018
RUN apk add --no-cache git

RUN mkdir /app
WORKDIR /app

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

COPY ./main.go /app/

ARG ARCH=amd64
ARG VERSION=dev
ENV CGO_ENABLED=0 GOOS=linux GOARCH=${ARCH}
RUN go build -ldflags "-X main.version=${VERSION}" -a -installsuffix nocgo -o tag-checker .

# hadolint ignore=DL3007
FROM alpine:latest as certs
# hadolint ignore=DL3018
RUN apk --no-cache add ca-certificates

FROM scratch
COPY --from=certs /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
COPY --from=builder /app/tag-checker /

ENTRYPOINT [ "/tag-checker" ]