initcontainer.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:1.17.5-alpine as builder

RUN apk add --no-cache gcc libc-dev git

WORKDIR /src/job-executor-service-initcontainer

ARG version=develop
ENV VERSION="${version}"

# Force the go compiler to use modules
ENV GO111MODULE=on
ENV BUILDFLAGS=""
ENV GOPROXY=https://proxy.golang.org

# Copy `go.mod` for definitions and `go.sum` to invalidate the next layer
# in case of a change in the dependencies
COPY go.mod go.sum ./

# Download dependencies
RUN go mod download

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

# `skaffold debug` sets SKAFFOLD_GO_GCFLAGS to disable compiler optimizations
ARG SKAFFOLD_GO_GCFLAGS
# Build the command inside the container.
# (You may fetch or manage dependencies here, either manually or with a tool like "godep".)
RUN GOOS=linux go build -ldflags '-linkmode=external' -gcflags="${SKAFFOLD_GO_GCFLAGS}" -v -o job-executor-service-initcontainer cmd/job-executor-service-initcontainer/main.go

# Use a Docker multi-stage build to create a lean production image.
# https://docs.docker.com/develop/develop-images/multistage-build/#use-multi-stage-builds
FROM alpine:3.16
ENV ENV=production

# Install extra packages
# See https://github.com/gliderlabs/docker-alpine/issues/136#issuecomment-272703023

RUN    apk update && apk upgrade \
	&& apk add ca-certificates libc6-compat \
	&& update-ca-certificates \
	&& rm -rf /var/cache/apk/*

ARG version=develop
ENV VERSION="${version}"

# Copy the binary to the production image from the builder stage.
COPY --from=builder /src/job-executor-service-initcontainer/job-executor-service-initcontainer /job-executor-service-initcontainer

EXPOSE 8080

# required for external tools to detect this as a go binary
ENV GOTRACEBACK=all

# Run the web service on container startup.
CMD ["/job-executor-service-initcontainer"]