Dockerfile

# Build the manager binary
FROM --platform=$BUILDPLATFORM golang:1.21 as builder

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
# 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  --mount=type=cache,target=/root/.local/share/golang \
     --mount=type=cache,target=/go/pkg/mod \
     go mod download

# Copy the go source
COPY ./ ./

ARG TARGETARCH

# Build
RUN --mount=type=cache,target=/root/.cache/go-build \
    --mount=type=cache,target=/go/pkg/mod \
    --mount=type=cache,target=/root/.local/share/golang \
    CGO_ENABLED=0 GOOS=linux GOARCH=${TARGETARCH} go build -a -o harbor-container-webhook main.go

# Use distroless as minimal base image to package the manager binary
# Refer to https://github.com/GoogleContainerTools/distroless for more details
FROM gcr.io/distroless/static:nonroot
WORKDIR /
COPY --from=builder /workspace/harbor-container-webhook .

# Use uid of nonroot user (65532) because kubernetes expects numeric user when applying pod security policies
USER 65532

ENTRYPOINT ["/harbor-container-webhook"]