knative-report-functions/isprime-go/Dockerfile

# Use the offical Golang image to create a build artifact.
# This is based on Debian and sets the GOPATH to /go.
# https://hub.docker.com/_/golang
FROM golang:1.13 as builder

RUN go get -u github.com/golang/dep/cmd/dep

# Create and change to the app directory.
WORKDIR /go/src/app

# Retrieve application dependencies.
# This allows the container build to reuse cached dependencies.
COPY go.* ./
RUN go mod download

# Copy local code to the container image.
COPY . ./

#Ensure dependencies with dep
RUN dep ensure

# Build the binary.
RUN CGO_ENABLED=0 GOOS=linux go build -v -o server

# Use the official Alpine image for a lean production container.
# https://hub.docker.com/_/alpine
# https://docs.docker.com/develop/develop-images/multistage-build/#use-multi-stage-builds
FROM alpine:3
RUN apk add --no-cache ca-certificates

# Copy the binary to the production image from the builder stage.
COPY --from=builder /go/src/app/server /server

# Run the web service on container startup.
CMD ["/server"]