Merge pull request #439 from benluddy/upstream-image-multistage

Use multi-stage build for registry image.

Author: kevinrizza

upstream-builder.Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.13-alpine
+FROM golang:1.13-alpine as builder
 
 RUN apk update && apk add sqlite build-base git mercurial bash
 WORKDIR /build
@@ -12,8 +12,15 @@ RUN make static
 RUN GRPC_HEALTH_PROBE_VERSION=v0.3.2 && \
     wget -qO/bin/grpc_health_probe https://github.com/grpc-ecosystem/grpc-health-probe/releases/download/${GRPC_HEALTH_PROBE_VERSION}/grpc_health_probe-linux-$(go env GOARCH) && \
     chmod +x /bin/grpc_health_probe
-RUN cp /build/bin/opm /bin/opm && \
-    cp /build/bin/initializer /bin/initializer && \
-    cp /build/bin/appregistry-server /bin/appregistry-server && \
-    cp /build/bin/configmap-server /bin/configmap-server && \
-    cp /build/bin/registry-server /bin/registry-server
+
+FROM alpine:3
+
+COPY --from=builder [ \
+    "/bin/grpc_health_probe", \
+    "/build/bin/opm", \
+    "/build/bin/initializer", \
+    "/build/bin/appregistry-server", \
+    "/build/bin/configmap-server", \
+    "/build/bin/registry-server", \
+    "/bin/" \
+]