Dockerfile

ARG BUILDER_IMAGE=golang:1.23
ARG BASE_IMAGE=gcr.io/distroless/static:nonroot
# Build the manager binary
FROM --platform=${BUILDPLATFORM} ${BUILDER_IMAGE} AS builder

ARG TARGETARCH

WORKDIR /workspace

COPY . .
# Build
# the GOARCH has not a default value to allow the binary be built according to the host where the command
# was called. For example, if we call make docker-build in a local env which has the Apple Silicon M1 SO
# the docker BUILDPLATFORM arg will be linux/arm64 when for Apple x86 it will be linux/amd64. Therefore,
# by leaving it empty we can ensure that the container and binary shipped on it will have the same platform.
RUN CGO_ENABLED=0 GOOS=${TARGETOS:-linux} GOARCH=${TARGETARCH} go build -a -o manager main.go

# Use distroless as minimal base image to package the manager binary
# Refer to https://github.com/GoogleContainerTools/distroless for more details
FROM --platform=${BUILDPLATFORM} gcr.io/distroless/static:nonroot
WORKDIR /
COPY --from=builder /workspace/manager .
USER 65532:65532

ENTRYPOINT ["/manager"]