runner image uses scratch

Author: kohbis

Dockerfile

@@ -1,12 +1,14 @@
 FROM golang:1.15.2-buster as builder
-ENV CGO_ENABLED 0
-ENV GOOS linux
-ENV GOARCH amd64
-ENV GO111MODULE on
+ENV CGO_ENABLED=0 \
+    GOOS=linux \
+    GOARCH=amd64 \
+    GO111MODULE=on
 WORKDIR /go/src/github.com/kohbis/dimg/
 COPY . .
 RUN go build
 
-FROM alpine:3.12 as runner
+FROM scratch as runner
+COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
 COPY --from=builder /go/src/github.com/kohbis/dimg/dimg /usr/local/bin/dimg
 ENTRYPOINT ["dimg"]
+