Dockerfile

# Build the manager binary
FROM --platform=${BUILDPLATFORM:-linux/amd64} golang:1.19 as builder

ARG TARGETPLATFORM
ARG BUILDPLATFORM
ARG TARGETOS
ARG TARGETARCH

WORKDIR /workspace
# Copy the Go Modules manifests
COPY go.mod go.mod
COPY go.sum go.sum
# cache deps before building and copying source so that we don't need to re-download as much
# and so that source changes don't invalidate our downloaded layer
RUN go mod download

# Copy the go source
COPY . .

# Build
RUN CGO_ENABLED=0 GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build -o cloudflare-ddns 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=${TARGETPLATFORM:-linux/amd64} gcr.io/distroless/static:nonroot
WORKDIR /
COPY --from=builder /workspace/cloudflare-ddns .
USER 65532:65532

ENTRYPOINT ["/cloudflare-ddns"]