Golang Dockerfile template for binary only images

Dockerfile

# 1. Build a statically linked binary
FROM golang:alpine as builder
# Install git to install dependencies (skip if vendored)
RUN apk add --update --no-cache git
# Copy source code to working directory
COPY . /src
WORKDIR /src
# Add some env vars for the build process
ENV CGO_ENABLED=0
ENV GOOS=linux
ENV GOARCH=amd64
# Build the statically linked binary
RUN go build -ldflags="-w -s" -o /app

# 2. Build a new image from scratch with just the app binary
FROM scratch
COPY --from=builder /app /app

# 3. Run the app binary.
ENTRYPOINT ["/app"]