WIP: dockerfile go

posts/2021-12-18-dockerfile-go.md

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+# Dockerfile for Go
+
+Each time I start new Go project, I repeat many steps.
+Like set up `.gitignore`, CI configs, Dockerfile, ...
+
+So I decide to have a baseline Dockerfile like this:
+
+```Dockerfile
+FROM golang:1.18beta1-bullseye as builder
+
+WORKDIR /build
+
+COPY go.mod .
+COPY go.sum .
+COPY vendor .
+COPY . .
+
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 GOAMD64=v3 go build -o ./app main.go
+
+FROM gcr.io/distroless/base-debian11
+
+COPY --from=builder /build/app /app
+
+ENTRYPOINT ["/app"]
+```