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Dockerfile
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# Accept the Go version for the image to be set as a build argument.
ARG GO_VERSION=1.16
# First stage: build the executable.
FROM golang:${GO_VERSION}-alpine AS builder
# Git is required for fetching the dependencies.
RUN apk add --no-cache git
RUN apk add ca-certificates
# Set the working directory outside $GOPATH to enable the support for modules.
WORKDIR /src
# Fetch dependencies first; they are less susceptible to change on every build
# and will therefore be cached for speeding up the next build
COPY ./go.mod ./go.sum ./
RUN GO111MODULE=on go mod download
# Import the code from the context.
COPY ./ ./
# Build the executable to `/app`. Mark the build as statically linked.
RUN GO111MODULE=on CGO_ENABLED=0 go build \
-installsuffix 'static' \
-o /app .
# Final stage: the running container.
FROM scratch AS final
COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
# Import the compiled executable from the first stage.
COPY --from=builder /app /app
# Run the compiled binary.
ENTRYPOINT ["/app"]