Dockerfile

# Build the manager binary
ARG GO_VERSION="1.24"
FROM golang:${GO_VERSION} AS builder
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 --mount=type=cache,target=/go/pkg/mod \
    go mod download

# Copy the go source
COPY api/ api/
COPY cmd/ cmd/
COPY hack/ hack/
COPY internal/ internal/
COPY pkg/ pkg/
COPY Makefile Makefile

ARG BUILD_DATE
ARG GIT_COMMIT
ARG GIT_RELEASE_COMMIT
ARG GIT_TREE_STATE
ARG GIT_VERSION

# 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 --mount=type=cache,target=/root/.cache/go-build \
    --mount=type=cache,target=/go/pkg/mod \
    bash -c "\
        source hack/version.sh && \
        make build-manager \
                CGO_ENABLED=0 GOOS=${TARGETOS:-linux} GOARCH=${TARGETARCH} \
                LDFLAGS=\"\$(version::ldflags)\" \
    "

# 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/bin/manager .
USER 65532:65532

ARG BUILD_DATE
ARG GIT_COMMIT
ARG GIT_RELEASE_COMMIT
ARG GIT_TREE_STATE
ARG GIT_VERSION

ENTRYPOINT ["/manager"]