Move Birthday Surprise to its own directory and add single platform Dockerfile

birthday2019/Dockerfile

@@ -1,10 +1,10 @@
-FROM golang:alpine3.8 as builder
-WORKDIR /project
-COPY surprise.go .
+FROM golang:1.11-alpine AS builder
 RUN apk add --no-cache git
 RUN go get github.com/pdevine/go-asciisprite
+WORKDIR /project
+COPY surprise.go .
 RUN CGO_ENABLED=0 GOOS=linux go build -a -ldflags '-extldflags "-static"' -o surprise surprise.go
 
 FROM scratch
 COPY --from=builder /project/surprise /surprise
-CMD ["/surprise"]
+ENTRYPOINT ["/surprise"]

birthday2019/Dockerfile.cross

@@ -0,0 +1,20 @@
+FROM --platform=$BUILDPLATFORM golang:1.11-alpine AS builder
+RUN apk add --no-cache git
+RUN go get github.com/pdevine/go-asciisprite
+WORKDIR /project
+COPY surprise.go .
+
+ARG TARGETOS
+ARG TARGETARCH
+ENV GOOS=$TARGETOS GOARCH=$TARGETARCH
+RUN CGO_ENABLED=0 go build -a -ldflags '-extldflags "-static"' -o surprise surprise.go
+
+FROM scratch AS release-linux
+COPY --from=builder /project/surprise /surprise
+ENTRYPOINT ["/surprise"]
+
+FROM microsoft/nanoserver AS release-windows
+COPY --from=builder /project/surprise /surprise.exe
+ENTRYPOINT ["\\surprise.exe"]
+
+FROM release-$TARGETOS

birthday2019/README.md

@@ -6,7 +6,7 @@ Happy Birthday, Docker!
 March 2019 marks Docker's sixth year, and we thought we'd celebrate it docker-style with a birthday surprise!
 To try it out, run:
 
-`docker run -it --rm surprise`
+`docker run -it --rm docker/surprise`
 
-Complete source can be found [here](https://github.com/docker/birthday).
+Complete source can be found [here](https://github.com/docker/doodle/birthday2019).