Dockerfile

FROM golang:alpine as BUILDER

RUN apk update && apk add --no-cache git
WORKDIR /src

# << bake dependencies into builder image
COPY go.mod .
COPY go.sum .
RUN go mod download
# >>

# bring source into image
COPY . .

# build
RUN CGO_ENABLED=0 go build -o /go/bin/imap-pusher github.com/rspier/random/imap-pusher

RUN touch /.empty

FROM scratch

WORKDIR /

COPY --from=builder /go/bin/imap-pusher /imap-pusher
# If we don't put something in the /tmp/ directory, it doesn't exist,
# since this is FROM scratch.
COPY --from=builder /.empty /tmp/.empty

COPY --from=builder /etc/ssl /etc/ssl