use multistep in docker-image

.github/workflows/main.yml

@@ -10,9 +10,6 @@ jobs:
     - name: test
       run: make docker-test
 
-    - name: build
-      run: make docker-build-static
-
     - name: acceptance-test
       run: make docker-acceptance
 

Dockerfile

@@ -1,8 +1,14 @@
 FROM alpine:latest as certs
 RUN apk add ca-certificates
 
+FROM golang:1.14 as build
+WORKDIR /go/src/github.com/yannh/kubeconform
+COPY . .
+RUN make build-static
+RUN find
+
 FROM scratch AS kubeconform
 MAINTAINER Yann HAMON <yann@mandragor.org>
 COPY --from=certs /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
-COPY bin/kubeconform /
+COPY --from=build bin/kubeconform /kubeconform
 ENTRYPOINT ["/kubeconform"]